From: Jan Kara jack@suse.cz
commit 61a1d87a324ad5e3ed27c6699dfc93218fcf3201 upstream.
The check in __ext4_read_dirblock() for block being outside of directory size was wrong because it compared block number against directory size in bytes. Fix it.
Fixes: 65f8ea4cd57d ("ext4: check if directory block is within i_size") CVE: CVE-2022-1184 CC: stable@vger.kernel.org Signed-off-by: Jan Kara jack@suse.cz Reviewed-by: Lukas Czerner lczerner@redhat.com Link: https://lore.kernel.org/r/20220822114832.1482-1-jack@suse.cz Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -125,7 +125,7 @@ static struct buffer_head *__ext4_read_d struct ext4_dir_entry *dirent; int is_dx_block = 0;
- if (block >= inode->i_size) { + if (block >= inode->i_size >> inode->i_blkbits) { ext4_error_inode(inode, func, line, block, "Attempting to read directory block (%u) that is past i_size (%llu)", block, inode->i_size);