reiserfs: check directory items on read from disk

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[ Upstream commit 13d257503c ]

While verifying the leaf item that we read from the disk, reiserfs
doesn't check the directory items, this could cause a crash when we
read a directory item from the disk that has an invalid deh_location.

This patch adds a check to the directory items read from the disk that
does a bounds check on deh_location for the directory entries. Any
directory entry header with a directory entry offset greater than the
item length is considered invalid.

Link: https://lore.kernel.org/r/20210709152929.766363-1-chouhan.shreyansh630@gmail.com
Reported-by: syzbot+c31a48e6702ccb3d64c9@syzkaller.appspotmail.com
Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Shreyansh Chouhan 2021-07-09 20:59:29 +05:30 • committed by Greg Kroah-Hartman

parent dbe4f82fed

commit ecd8614809

1 changed files with 26 additions and 5 deletions

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fs/reiserfs/stree.c

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