ext4: add bounds checking in get_max_inline_xattr_value_size()
authorTheodore Ts'o <tytso@mit.edu>
Fri, 12 May 2023 19:11:02 +0000 (15:11 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Sat, 13 May 2023 22:05:05 +0000 (18:05 -0400)
commit2220eaf90992c11d888fe771055d4de330385f01
treed2eeb25d351f25b468184ddfa54931bc498f8713
parent6dcc98fbc46511f7a6650946f198df6951a5a88c
ext4: add bounds checking in get_max_inline_xattr_value_size()

Normally the extended attributes in the inode body would have been
checked when the inode is first opened, but if someone is writing to
the block device while the file system is mounted, it's possible for
the inode table to get corrupted.  Add bounds checking to avoid
reading beyond the end of allocated memory if this happens.

Reported-by: syzbot+1966db24521e5f6e23f7@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=1966db24521e5f6e23f7
Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
fs/ext4/inline.c