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jfs: Regular file corruption check

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[ Upstream commit 2d04df8116426b6c7b9f8b9b371250f666a2a2fb ]

The reproducer builds a corrupted file on disk with a negative i_size value.
Add a check when opening this file to avoid subsequent operation failures.

Reported-by: syzbot+630f6d40b3ccabc8e96e@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=630f6d40b3ccabc8e96e
Tested-by: syzbot+630f6d40b3ccabc8e96e@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Edward Adam Davis 2025-06-04 14:48:43 +08:00 • committed by Greg Kroah-Hartman
commit 9f896c3d01
1 changed files with 3 additions and 0 deletions
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3
fs/jfs/file.c
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@ -44,6 +44,9 @@ static int jfs_open(struct inode *inode, struct file *file)
{
int rc;
if (S_ISREG(inode->i_mode) && inode->i_size < 0)
return -EIO;
if ((rc = dquot_file_open(inode, file)))
return rc;