Hi,
On Tue, Aug 23, 2022 at 12:00:19PM +0200, Lukas Czerner wrote:
On Mon, Aug 22, 2022 at 01:48:32PM +0200, Jan Kara wrote:
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.
Good catch, thanks!
Reviewed-by: Lukas Czerner lczerner@redhat.com
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
fs/ext4/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 3a31b662f661..bc2e0612ec32 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -126,7 +126,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, 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);
Ted, is this on your radar to get applied for mainline and to the stable trees?
Regards, Salvatore