diff options
| author | Eric Dumazet <edumazet@google.com> | 2018-04-07 13:42:36 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2018-10-21 08:45:17 +0100 |
| commit | 8aa698134a884c5597ef45274d16601ba63065ed (patch) | |
| tree | c987a06fda0ebd8c0d2e5d45b6399e4da31cf7b8 /crypto | |
| parent | d720b91ae0ba14c4547e9b523ccb409e62570a03 (diff) | |
crypto: af_alg - fix possible uninit-value in alg_bind()
commit a466856e0b7ab269cdf9461886d007e88ff575b0 upstream.
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>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/af_alg.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 9821a116047e..7f06df512f24 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -157,16 +157,16 @@ 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) - 1] = 0; |