github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-12 16:18:45 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl

Browse Source 
When page reassignment was added to af_alg_pull_tsgl the original
loop wasn't updated so it may try to reassign one more page than
necessary.

Add the check to the reassignment so that this does not happen.

Also update the comment which still refers to the obsolete offset
argument.

Reported-by: syzbot+d23888375c2737c17ba5@syzkaller.appspotmail.com
Fixes: e870456d8e ("crypto: algif_skcipher - overhaul memory management")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2026-04-04 08:29:58 +08:00
parent 8eceab19eb
commit 31d00156e5
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
crypto/af_alg.c
View File

@ -705,8 +705,8 @@ void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst)
* Assumption: caller created af_alg_count_tsgl(len)
* SG entries in dst.
*/
if (dst) {
/* reassign page to dst after offset */
if (dst && plen) {
/* reassign page to dst */
get_page(page);
sg_set_page(dst + j, page, plen, sg[i].offset);
j++;