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authorEric Biggers <ebiggers@google.com>2017-11-28 00:46:24 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2017-11-29 13:39:14 +1100
commit887207ed9e5812ed9239b6d07185a2d35dda91db (patch)
treecadb413b15f8fd9699ad3f48638795a7bb9fb31e /crypto
parentb32a7dc8aef1882fbf983eb354837488cc9d54dc (diff)
download96b-common-887207ed9e5812ed9239b6d07185a2d35dda91db.tar.gz
crypto: af_alg - fix NULL pointer dereference in
af_alg_free_areq_sgls() If allocating the ->tsgl member of 'struct af_alg_async_req' failed, during cleanup we dereferenced the NULL ->tsgl pointer in af_alg_free_areq_sgls(), because ->tsgl_entries was nonzero. Fix it by only freeing the ->tsgl list if it is non-NULL. This affected both algif_skcipher and algif_aead. Fixes: e870456d8e7c ("crypto: algif_skcipher - overhaul memory management") Fixes: d887c52d6ae4 ("crypto: algif_aead - overhaul memory management") Reported-by: syzbot <syzkaller@googlegroups.com> Cc: <stable@vger.kernel.org> # v4.14+ Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/af_alg.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 85cea9de324a..1e5353f62067 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -672,14 +672,15 @@ void af_alg_free_areq_sgls(struct af_alg_async_req *areq)
}
tsgl = areq->tsgl;
- for_each_sg(tsgl, sg, areq->tsgl_entries, i) {
- if (!sg_page(sg))
- continue;
- put_page(sg_page(sg));
- }
+ if (tsgl) {
+ for_each_sg(tsgl, sg, areq->tsgl_entries, i) {
+ if (!sg_page(sg))
+ continue;
+ put_page(sg_page(sg));
+ }
- if (areq->tsgl && areq->tsgl_entries)
sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl));
+ }
}
EXPORT_SYMBOL_GPL(af_alg_free_areq_sgls);