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Message-Id: <1548057848-15136-16-git-send-email-rppt@linux.ibm.com>
Date:   Mon, 21 Jan 2019 10:04:02 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Zhou <dennis@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guan Xuetao <gxt@....edu.cn>, Guo Ren <guoren@...nel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Mark Salter <msalter@...hat.com>,
        Matt Turner <mattst88@...il.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Paul Burton <paul.burton@...s.com>,
        Petr Mladek <pmladek@...e.com>, Rich Felker <dalias@...c.org>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        devicetree@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-c6x-dev@...ux-c6x.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-um@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org,
        xen-devel@...ts.xenproject.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v2 15/21] sparc: add checks for the return value of memblock_alloc*()

Add panic() calls if memblock_alloc*() returns NULL.

Most of the changes are simply addition of

        if(!ptr)
                panic();

statements after the calls to memblock_alloc*() variants.

Exceptions are pcpu_populate_pte() and kernel_map_range() that were
slightly refactored to accommodate the change.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Acked-by: David S. Miller <davem@...emloft.net>
---
 arch/sparc/kernel/prom_32.c  |  2 ++
 arch/sparc/kernel/setup_64.c |  6 ++++++
 arch/sparc/kernel/smp_64.c   | 12 ++++++++++++
 arch/sparc/mm/init_64.c      | 11 +++++++++++
 arch/sparc/mm/srmmu.c        |  8 ++++++++
 5 files changed, 39 insertions(+)

diff --git a/arch/sparc/kernel/prom_32.c b/arch/sparc/kernel/prom_32.c
index e7126ca..869b16c 100644
--- a/arch/sparc/kernel/prom_32.c
+++ b/arch/sparc/kernel/prom_32.c
@@ -33,6 +33,8 @@ void * __init prom_early_alloc(unsigned long size)
 	void *ret;
 
 	ret = memblock_alloc(size, SMP_CACHE_BYTES);
+	if (!ret)
+		panic("%s: Failed to allocate %lu bytes\n", __func__, size);
 
 	prom_early_allocated += size;
 
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 51c4d12..fd2182a 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -624,8 +624,14 @@ void __init alloc_irqstack_bootmem(void)
 
 		softirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
 						       THREAD_SIZE, node);
+		if (!softirq_stack[i])
+			panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
+			      __func__, THREAD_SIZE, THREAD_SIZE, node);
 		hardirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
 						       THREAD_SIZE, node);
+		if (!hardirq_stack[i])
+			panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
+			      __func__, THREAD_SIZE, THREAD_SIZE, node);
 	}
 }
 
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index f45d876..a8275fe 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1628,6 +1628,8 @@ static void __init pcpu_populate_pte(unsigned long addr)
 		pud_t *new;
 
 		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+		if (!new)
+			goto err_alloc;
 		pgd_populate(&init_mm, pgd, new);
 	}
 
@@ -1636,6 +1638,8 @@ static void __init pcpu_populate_pte(unsigned long addr)
 		pmd_t *new;
 
 		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+		if (!new)
+			goto err_alloc;
 		pud_populate(&init_mm, pud, new);
 	}
 
@@ -1644,8 +1648,16 @@ static void __init pcpu_populate_pte(unsigned long addr)
 		pte_t *new;
 
 		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+		if (!new)
+			goto err_alloc;
 		pmd_populate_kernel(&init_mm, pmd, new);
 	}
+
+	return;
+
+err_alloc:
+	panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
+	      __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
 }
 
 void __init setup_per_cpu_areas(void)
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index ef340e8..f2d70ff 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1809,6 +1809,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
 
 			new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
 						  PAGE_SIZE);
+			if (!new)
+				goto err_alloc;
 			alloc_bytes += PAGE_SIZE;
 			pgd_populate(&init_mm, pgd, new);
 		}
@@ -1822,6 +1824,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
 			}
 			new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
 						  PAGE_SIZE);
+			if (!new)
+				goto err_alloc;
 			alloc_bytes += PAGE_SIZE;
 			pud_populate(&init_mm, pud, new);
 		}
@@ -1836,6 +1840,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
 			}
 			new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
 						  PAGE_SIZE);
+			if (!new)
+				goto err_alloc;
 			alloc_bytes += PAGE_SIZE;
 			pmd_populate_kernel(&init_mm, pmd, new);
 		}
@@ -1855,6 +1861,11 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
 	}
 
 	return alloc_bytes;
+
+err_alloc:
+	panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
+	      __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+	return -ENOMEM;
 }
 
 static void __init flush_all_kernel_tsbs(void)
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index a400ec3..aaebbc0 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -305,11 +305,17 @@ static void __init srmmu_nocache_init(void)
 
 	srmmu_nocache_pool = memblock_alloc(srmmu_nocache_size,
 					    SRMMU_NOCACHE_ALIGN_MAX);
+	if (!srmmu_nocache_pool)
+		panic("%s: Failed to allocate %lu bytes align=0x%x\n",
+		      __func__, srmmu_nocache_size, SRMMU_NOCACHE_ALIGN_MAX);
 	memset(srmmu_nocache_pool, 0, srmmu_nocache_size);
 
 	srmmu_nocache_bitmap =
 		memblock_alloc(BITS_TO_LONGS(bitmap_bits) * sizeof(long),
 			       SMP_CACHE_BYTES);
+	if (!srmmu_nocache_bitmap)
+		panic("%s: Failed to allocate %zu bytes\n", __func__,
+		      BITS_TO_LONGS(bitmap_bits) * sizeof(long));
 	bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits);
 
 	srmmu_swapper_pg_dir = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE);
@@ -468,6 +474,8 @@ static void __init sparc_context_init(int numctx)
 
 	size = numctx * sizeof(struct ctx_list);
 	ctx_list_pool = memblock_alloc(size, SMP_CACHE_BYTES);
+	if (!ctx_list_pool)
+		panic("%s: Failed to allocate %lu bytes\n", __func__, size);
 
 	for (ctx = 0; ctx < numctx; ctx++) {
 		struct ctx_list *clist;
-- 
2.7.4

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