linux-kernel - Re: [syzbot] WARNING in iomap

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Date:   Thu, 18 Aug 2022 16:41:17 +0530
From:   Siddh Raman Pant <code@...dh.me>
To:     code@...dh.me
Cc:     david@...morbit.com, djwong@...nel.org, fgheet255t@...il.com,
        hch@...radead.org, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, riteshh@...ux.ibm.com,
        syzbot+a8e049cd3abd342936b6@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in iomap_iter

The last test patch accidentally left out less-than-zero checks...

Is there a way to cancel previously requested tests?

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 drivers/block/loop.c      |  3 +++
 include/uapi/linux/loop.h | 12 ++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e3c0ba93c1a3..4ca20ce3158d 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -977,6 +977,9 @@ loop_set_status_from_info(struct loop_device *lo,
 		return -EINVAL;
 	}
 
+	if (info->lo_offset < 0 || info->lo_sizelimit < 0)
+		return -EINVAL;
+
 	lo->lo_offset = info->lo_offset;
 	lo->lo_sizelimit = info->lo_sizelimit;
 	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
diff --git a/include/uapi/linux/loop.h b/include/uapi/linux/loop.h
index 6f63527dd2ed..973565f38f9d 100644
--- a/include/uapi/linux/loop.h
+++ b/include/uapi/linux/loop.h
@@ -53,12 +53,12 @@ struct loop_info64 {
 	__u64		   lo_device;			/* ioctl r/o */
 	__u64		   lo_inode;			/* ioctl r/o */
 	__u64		   lo_rdevice;			/* ioctl r/o */
-	__u64		   lo_offset;
-	__u64		   lo_sizelimit;/* bytes, 0 == max available */
-	__u32		   lo_number;			/* ioctl r/o */
-	__u32		   lo_encrypt_type;		/* obsolete, ignored */
-	__u32		   lo_encrypt_key_size;		/* ioctl w/o */
-	__u32		   lo_flags;
+	__s64		   lo_offset;
+	__s64		   lo_sizelimit;/* bytes, 0 == max available */
+	__s32		   lo_number;			/* ioctl r/o */
+	__s32		   lo_encrypt_type;		/* obsolete, ignored */
+	__s32		   lo_encrypt_key_size;		/* ioctl w/o */
+	__s32		   lo_flags;
 	__u8		   lo_file_name[LO_NAME_SIZE];
 	__u8		   lo_crypt_name[LO_NAME_SIZE];
 	__u8		   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
-- 
2.35.1