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authorEric Dumazet <edumazet@google.com>2018-04-07 13:42:36 -0700
committerDavid S. Miller <davem@davemloft.net>2018-04-07 22:32:31 -0400
commita466856e0b7ab269cdf9461886d007e88ff575b0 (patch)
treee21908fe4aab1743d2da862b976bfec09b371d22 /crypto/af_alg.c
parentf12c643209db0626f2f54780d86bb93bfa7a9c2d (diff)
downloadlinux-a466856e0b7ab269cdf9461886d007e88ff575b0.tar.bz2
crypto: af_alg - fix possible uninit-value in alg_bind()
syzbot reported : BUG: KMSAN: uninit-value in alg_bind+0xe3/0xd90 crypto/af_alg.c:162 We need to check addr_len before dereferencing sa (or uaddr) Fixes: bb30b8848c85 ("crypto: af_alg - whitelist mask and type") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Cc: Stephan Mueller <smueller@chronox.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto/af_alg.c')
-rw-r--r--crypto/af_alg.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index c49766b03165..7846c0c20cfe 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -158,16 +158,16 @@ static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
void *private;
int err;
- /* If caller uses non-allowed flag, return error. */
- if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed))
- return -EINVAL;
-
if (sock->state == SS_CONNECTED)
return -EINVAL;
if (addr_len < sizeof(*sa))
return -EINVAL;
+ /* If caller uses non-allowed flag, return error. */
+ if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed))
+ return -EINVAL;
+
sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0;