FS: JFS: Fix null-ptr-deref Read in txBegin

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[ Upstream commit 47cfdc338d ]

 Syzkaller reported an issue where txBegin may be called
 on a superblock in a read-only mounted filesystem which leads
 to NULL pointer deref. This could be solved by checking if
 the filesystem is read-only before calling txBegin, and returning
 with appropiate error code.

Reported-By: syzbot+f1faa20eec55e0c8644c@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=be7e52c50c5182cc09a09ea6fc456446b2039de3

Signed-off-by: Immad Mir <mirimmad17@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Immad Mir 2023-06-23 19:14:01 +05:30 • committed by Greg Kroah-Hartman

parent 1a4d22d8d1

commit fd2db13fb7

1 changed files with 5 additions and 0 deletions

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fs/jfs/namei.c

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