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| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2024-06-29 01:51:07 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-18 11:39:39 +0200 |
| commit | ff9767ba2cb949701e45e6e4287f8af82986b703 (patch) | |
| tree | feeaafbad391a28488a31f864b930fc5a7d550a8 /scripts/gcc-plugins/gcc-common.h | |
| parent | 17866066b8ac1cc38fb449670bc15dc9fee4b40a (diff) | |
nilfs2: fix kernel bug on rename operation of broken directory
commit a9e1ddc09ca55746079cc479aa3eb6411f0d99d4 upstream.
Syzbot reported that in rename directory operation on broken directory on
nilfs2, __block_write_begin_int() called to prepare block write may fail
BUG_ON check for access exceeding the folio/page size.
This is because nilfs_dotdot(), which gets parent directory reference
entry ("..") of the directory to be moved or renamed, does not check
consistency enough, and may return location exceeding folio/page size for
broken directories.
Fix this issue by checking required directory entries ("." and "..") in
the first chunk of the directory in nilfs_dotdot().
Link: https://lkml.kernel.org/r/20240628165107.9006-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+d3abed1ad3d367fa2627@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d3abed1ad3d367fa2627
Fixes: 2ba466d74ed7 ("nilfs2: directory entry operations")
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/gcc-plugins/gcc-common.h')
0 files changed, 0 insertions, 0 deletions