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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2020-04-10 16:09:42 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-04-16 16:49:22 +1000 |
| commit | 6603523bf5e432c7c8490fb500793bb15d4e5f61 (patch) | |
| tree | a55f489fb787cdc482819bcf29a1a0327549637e /security | |
| parent | eebac678556d6927f09a992872f4464cf3aecc76 (diff) | |
crypto: api - Fix use-after-free and race in crypto_spawn_alg
There are two problems in crypto_spawn_alg. First of all it may
return spawn->alg even if spawn->dead is set. This results in a
double-free as detected by syzbot.
Secondly the setting of the DYING flag is racy because we hold
the read-lock instead of the write-lock. We should instead call
crypto_shoot_alg in a safe manner by gaining a refcount, dropping
the lock, and then releasing the refcount.
This patch fixes both problems.
Reported-by: syzbot+fc0674cde00b66844470@syzkaller.appspotmail.com
Fixes: 4f87ee118d16 ("crypto: api - Do not zap spawn->alg")
Fixes: 73669cc55646 ("crypto: api - Fix race condition in...")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions