Date:   Fri, 26 Feb 2021 11:10:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, stable@...r.kernel.org
Cc:     lwn@....net, jslaby@...e.cz,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Linux 5.4.101

diff --git a/Makefile b/Makefile
index d0d4beb4f837..f56442751d2c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 VERSION = 5
 PATCHLEVEL = 4
-SUBLEVEL = 100
+SUBLEVEL = 101
 EXTRAVERSION =
 NAME = Kleptomaniac Octopus
 
diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
index 078d2506365c..8a02b26d07cd 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
@@ -917,6 +917,7 @@
 			 <&tegra_car 128>, /* hda2hdmi */
 			 <&tegra_car 111>; /* hda2codec_2x */
 		reset-names = "hda", "hda2hdmi", "hda2codec_2x";
+		power-domains = <&pd_sor>;
 		status = "disabled";
 	};
 
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index d2ecc9c45255..263eca119ff0 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -90,7 +90,7 @@ EXPORT_SYMBOL_GPL(hid_register_report);
  * Register a new field for this report.
  */
 
-static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
+static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages)
 {
 	struct hid_field *field;
 
@@ -101,7 +101,7 @@ static struct hid_field *hid_register_field(struct hid_report *report, unsigned
 
 	field = kzalloc((sizeof(struct hid_field) +
 			 usages * sizeof(struct hid_usage) +
-			 values * sizeof(unsigned)), GFP_KERNEL);
+			 usages * sizeof(unsigned)), GFP_KERNEL);
 	if (!field)
 		return NULL;
 
@@ -300,7 +300,7 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign
 	usages = max_t(unsigned, parser->local.usage_index,
 				 parser->global.report_count);
 
-	field = hid_register_field(report, usages, parser->global.report_count);
+	field = hid_register_field(report, usages);
 	if (!field)
 		return 0;
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_pci_id_tbl.h b/drivers/net/ethernet/chelsio/cxgb4/t4_pci_id_tbl.h
index 0c5373462ced..0b1b5f9c67d4 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_pci_id_tbl.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_pci_id_tbl.h
@@ -219,6 +219,7 @@ CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN
 	CH_PCI_ID_TABLE_FENTRY(0x6089), /* Custom T62100-KR */
 	CH_PCI_ID_TABLE_FENTRY(0x608a), /* Custom T62100-CR */
 	CH_PCI_ID_TABLE_FENTRY(0x608b), /* Custom T6225-CR */
+	CH_PCI_ID_TABLE_FENTRY(0x6092), /* Custom T62100-CR-LOM */
 CH_PCI_DEVICE_ID_TABLE_DEFINE_END;
 
 #endif /* __T4_PCI_ID_TBL_H__ */
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 72a3a5dc5131..5a1d21aae2a9 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1354,6 +1354,7 @@ static const struct usb_device_id products[] = {
 	{QMI_FIXED_INTF(0x1e2d, 0x0082, 5)},	/* Cinterion PHxx,PXxx (2 RmNet) */
 	{QMI_FIXED_INTF(0x1e2d, 0x0083, 4)},	/* Cinterion PHxx,PXxx (1 RmNet + USB Audio)*/
 	{QMI_QUIRK_SET_DTR(0x1e2d, 0x00b0, 4)},	/* Cinterion CLS8 */
+	{QMI_FIXED_INTF(0x1e2d, 0x00b7, 0)},	/* Cinterion MV31 RmNet */
 	{QMI_FIXED_INTF(0x413c, 0x81a2, 8)},	/* Dell Wireless 5806 Gobi(TM) 4G LTE Mobile Broadband Card */
 	{QMI_FIXED_INTF(0x413c, 0x81a3, 8)},	/* Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card */
 	{QMI_FIXED_INTF(0x413c, 0x81a4, 8)},	/* Dell Wireless 5570e HSPA+ (42Mbps) Mobile Broadband Card */
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index c1592403222f..239443ce5200 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -391,6 +391,9 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* X-Rite/Gretag-Macbeth Eye-One Pro display colorimeter */
 	{ USB_DEVICE(0x0971, 0x2000), .driver_info = USB_QUIRK_NO_SET_INTF },
 
+	/* ELMO L-12F document camera */
+	{ USB_DEVICE(0x09a1, 0x0028), .driver_info = USB_QUIRK_DELAY_CTRL_MSG },
+
 	/* Broadcom BCM92035DGROM BT dongle */
 	{ USB_DEVICE(0x0a5c, 0x2021), .driver_info = USB_QUIRK_RESET_RESUME },
 
@@ -415,6 +418,9 @@ static const struct usb_device_id usb_quirk_list[] = {
 	{ USB_DEVICE(0x10d6, 0x2200), .driver_info =
 			USB_QUIRK_STRING_FETCH_255 },
 
+	/* novation SoundControl XL */
+	{ USB_DEVICE(0x1235, 0x0061), .driver_info = USB_QUIRK_RESET_RESUME },
+
 	/* Huawei 4G LTE module */
 	{ USB_DEVICE(0x12d1, 0x15bb), .driver_info =
 			USB_QUIRK_DISCONNECT_SUSPEND },
@@ -495,9 +501,6 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* INTEL VALUE SSD */
 	{ USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },
 
-	/* novation SoundControl XL */
-	{ USB_DEVICE(0x1235, 0x0061), .driver_info = USB_QUIRK_RESET_RESUME },
-
 	{ }  /* terminating entry must be last */
 };
 
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ab9eeb5ff8e5..67c2e6487479 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4198,6 +4198,7 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
 		cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
 		if (cifs_sb->prepath == NULL)
 			return -ENOMEM;
+		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
 	}
 
 	return 0;
diff --git a/fs/dax.c b/fs/dax.c
index cc56313c6b3b..3b0e5da96d54 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -794,12 +794,12 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
 		address = pgoff_address(index, vma);
 
 		/*
-		 * Note because we provide range to follow_pte_pmd it will
-		 * call mmu_notifier_invalidate_range_start() on our behalf
-		 * before taking any lock.
+		 * follow_invalidate_pte() will use the range to call
+		 * mmu_notifier_invalidate_range_start() on our behalf before
+		 * taking any lock.
 		 */
-		if (follow_pte_pmd(vma->vm_mm, address, &range,
-				   &ptep, &pmdp, &ptl))
+		if (follow_invalidate_pte(vma->vm_mm, address, &range, &ptep,
+					  &pmdp, &ptl))
 			continue;
 
 		/*
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 84933a0af49b..672feb96e250 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -628,6 +628,12 @@ static int ntfs_read_locked_inode(struct inode *vi)
 	}
 	a = ctx->attr;
 	/* Get the standard information attribute value. */
+	if ((u8 *)a + le16_to_cpu(a->data.resident.value_offset)
+			+ le32_to_cpu(a->data.resident.value_length) >
+			(u8 *)ctx->mrec + vol->mft_record_size) {
+		ntfs_error(vi->i_sb, "Corrupt standard information attribute in inode.");
+		goto unm_err_out;
+	}
 	si = (STANDARD_INFORMATION*)((u8*)a +
 			le16_to_cpu(a->data.resident.value_offset));
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7249cf58f78d..c63e4b38b7fe 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1466,9 +1466,11 @@ void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 		unsigned long end, unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
 			struct vm_area_struct *vma);
-int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
-		   struct mmu_notifier_range *range,
-		   pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);
+int follow_invalidate_pte(struct mm_struct *mm, unsigned long address,
+			  struct mmu_notifier_range *range, pte_t **ptepp,
+			  pmd_t **pmdpp, spinlock_t **ptlp);
+int follow_pte(struct mm_struct *mm, unsigned long address,
+	       pte_t **ptepp, spinlock_t **ptlp);
 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
 	unsigned long *pfn);
 int follow_phys(struct vm_area_struct *vma, unsigned long address,
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 2c248c4f6419..e6a43c0fdee8 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -9005,7 +9005,7 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
 			bool isdiv = BPF_OP(insn->code) == BPF_DIV;
 			struct bpf_insn *patchlet;
 			struct bpf_insn chk_and_div[] = {
-				/* Rx div 0 -> 0 */
+				/* [R,W]x div 0 -> 0 */
 				BPF_RAW_INSN((is64 ? BPF_JMP : BPF_JMP32) |
 					     BPF_JNE | BPF_K, insn->src_reg,
 					     0, 2, 0),
@@ -9014,16 +9014,18 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
 				*insn,
 			};
 			struct bpf_insn chk_and_mod[] = {
-				/* Rx mod 0 -> Rx */
+				/* [R,W]x mod 0 -> [R,W]x */
 				BPF_RAW_INSN((is64 ? BPF_JMP : BPF_JMP32) |
 					     BPF_JEQ | BPF_K, insn->src_reg,
-					     0, 1, 0),
+					     0, 1 + (is64 ? 0 : 1), 0),
 				*insn,
+				BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+				BPF_MOV32_REG(insn->dst_reg, insn->dst_reg),
 			};
 
 			patchlet = isdiv ? chk_and_div : chk_and_mod;
 			cnt = isdiv ? ARRAY_SIZE(chk_and_div) :
-				      ARRAY_SIZE(chk_and_mod);
+				      ARRAY_SIZE(chk_and_mod) - (is64 ? 2 : 0);
 
 			new_prog = bpf_patch_insn_data(env, i + delta, patchlet, cnt);
 			if (!new_prog)
diff --git a/mm/memory.c b/mm/memory.c
index 2157bb28117a..b23831132933 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4222,9 +4222,9 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
 }
 #endif /* __PAGETABLE_PMD_FOLDED */
 
-static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
-			    struct mmu_notifier_range *range,
-			    pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
+int follow_invalidate_pte(struct mm_struct *mm, unsigned long address,
+			  struct mmu_notifier_range *range, pte_t **ptepp,
+			  pmd_t **pmdpp, spinlock_t **ptlp)
 {
 	pgd_t *pgd;
 	p4d_t *p4d;
@@ -4289,31 +4289,33 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 	return -EINVAL;
 }
 
-static inline int follow_pte(struct mm_struct *mm, unsigned long address,
-			     pte_t **ptepp, spinlock_t **ptlp)
-{
-	int res;
-
-	/* (void) is needed to make gcc happy */
-	(void) __cond_lock(*ptlp,
-			   !(res = __follow_pte_pmd(mm, address, NULL,
-						    ptepp, NULL, ptlp)));
-	return res;
-}
-
-int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
-		   struct mmu_notifier_range *range,
-		   pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
+/**
+ * follow_pte - look up PTE at a user virtual address
+ * @mm: the mm_struct of the target address space
+ * @address: user virtual address
+ * @ptepp: location to store found PTE
+ * @ptlp: location to store the lock for the PTE
+ *
+ * On a successful return, the pointer to the PTE is stored in @ptepp;
+ * the corresponding lock is taken and its location is stored in @ptlp.
+ * The contents of the PTE are only stable until @ptlp is released;
+ * any further use, if any, must be protected against invalidation
+ * with MMU notifiers.
+ *
+ * Only IO mappings and raw PFN mappings are allowed.  The mmap semaphore
+ * should be taken for read.
+ *
+ * KVM uses this function.  While it is arguably less bad than ``follow_pfn``,
+ * it is not a good general-purpose API.
+ *
+ * Return: zero on success, -ve otherwise.
+ */
+int follow_pte(struct mm_struct *mm, unsigned long address,
+	       pte_t **ptepp, spinlock_t **ptlp)
 {
-	int res;
-
-	/* (void) is needed to make gcc happy */
-	(void) __cond_lock(*ptlp,
-			   !(res = __follow_pte_pmd(mm, address, range,
-						    ptepp, pmdpp, ptlp)));
-	return res;
+	return follow_invalidate_pte(mm, address, NULL, ptepp, NULL, ptlp);
 }
-EXPORT_SYMBOL(follow_pte_pmd);
+EXPORT_SYMBOL_GPL(follow_pte);
 
 /**
  * follow_pfn - look up PFN at a user virtual address
@@ -4323,6 +4325,9 @@ EXPORT_SYMBOL(follow_pte_pmd);
  *
  * Only IO mappings and raw PFN mappings are allowed.
  *
+ * This function does not allow the caller to read the permissions
+ * of the PTE.  Do not use it.
+ *
  * Return: zero and the pfn at @pfn on success, -ve otherwise.
  */
 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
diff --git a/scripts/Makefile b/scripts/Makefile
index 3e86b300f5a1..b4b7d8b58cd6 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -10,6 +10,9 @@
 
 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
 
+CRYPTO_LIBS = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
+CRYPTO_CFLAGS = $(shell pkg-config --cflags libcrypto 2> /dev/null)
+
 hostprogs-$(CONFIG_BUILD_BIN2C)  += bin2c
 hostprogs-$(CONFIG_KALLSYMS)     += kallsyms
 hostprogs-$(CONFIG_LOGO)         += pnmtologo
@@ -23,8 +26,10 @@ hostprogs-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
 
 HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include
 HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
-HOSTLDLIBS_sign-file = -lcrypto
-HOSTLDLIBS_extract-cert = -lcrypto
+HOSTCFLAGS_sign-file.o = $(CRYPTO_CFLAGS)
+HOSTLDLIBS_sign-file = $(CRYPTO_LIBS)
+HOSTCFLAGS_extract-cert.o = $(CRYPTO_CFLAGS)
+HOSTLDLIBS_extract-cert = $(CRYPTO_LIBS)
 
 always		:= $(hostprogs-y) $(hostprogs-m)
 
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 3f77a5d695c1..0bafed857e17 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -268,7 +268,11 @@ if ($arch eq "x86_64") {
 
     # force flags for this arch
     $ld .= " -m shlelf_linux";
-    $objcopy .= " -O elf32-sh-linux";
+    if ($endian eq "big") {
+        $objcopy .= " -O elf32-shbig-linux";
+    } else {
+        $objcopy .= " -O elf32-sh-linux";
+    }
 
 } elsif ($arch eq "powerpc") {
     my $ldemulation;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f25b5043cbca..048b555c5acc 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1598,10 +1598,12 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
 			       bool write_fault, bool *writable,
 			       kvm_pfn_t *p_pfn)
 {
-	unsigned long pfn;
+	kvm_pfn_t pfn;
+	pte_t *ptep;
+	spinlock_t *ptl;
 	int r;
 
-	r = follow_pfn(vma, addr, &pfn);
+	r = follow_pte(vma->vm_mm, addr, &ptep, &ptl);
 	if (r) {
 		/*
 		 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
@@ -1616,14 +1618,19 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
 		if (r)
 			return r;
 
-		r = follow_pfn(vma, addr, &pfn);
+		r = follow_pte(vma->vm_mm, addr, &ptep, &ptl);
 		if (r)
 			return r;
+	}
 
+	if (write_fault && !pte_write(*ptep)) {
+		pfn = KVM_PFN_ERR_RO_FAULT;
+		goto out;
 	}
 
 	if (writable)
-		*writable = true;
+		*writable = pte_write(*ptep);
+	pfn = pte_pfn(*ptep);
 
 	/*
 	 * Get a reference here because callers of *hva_to_pfn* and
@@ -1638,6 +1645,8 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
 	 */ 
 	kvm_get_pfn(pfn);
 
+out:
+	pte_unmap_unlock(ptep, ptl);
 	*p_pfn = pfn;
 	return 0;
 }

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