diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2025-09-16 15:42:41 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-25 11:13:49 +0200 |
| commit | 24c1106504c625fabd3b7229611af617b4c27ac7 (patch) | |
| tree | 22e27692be6379f49dd9c824d7f3b6cce45fb81b | |
| parent | 6ae90a2baf923e85eb037b636aa641250bf4220f (diff) | |
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
[ Upstream commit 9574b2330dbd2b5459b74d3b5e9619d39299fc6f ]
If an error causes af_alg_sendmsg to abort, ctx->merge may contain
a garbage value from the previous loop. This may then trigger a
crash on the next entry into af_alg_sendmsg when it attempts to do
a merge that can't be done.
Fix this by setting ctx->merge to zero near the start of the loop.
Fixes: 8ff590903d5 ("crypto: algif_skcipher - User-space interface for skcipher operations")
Reported-by: Muhammad Alifa Ramdhan <ramdhan@starlabs.sg>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | crypto/af_alg.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c index f02c5586a8ab..ca6fdcc6c54a 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -1025,6 +1025,8 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, continue; } + ctx->merge = 0; + if (!af_alg_writable(sk)) { err = af_alg_wait_for_wmem(sk, msg->msg_flags); if (err) @@ -1064,7 +1066,6 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, ctx->used += plen; copied += plen; size -= plen; - ctx->merge = 0; } else { do { struct page *pg; |