From: Stephan Mueller Date: Sat, 7 Jul 2018 18:41:47 +0000 (+0200) Subject: crypto: af_alg - Initialize sg_num_bytes in error code path X-Git-Tag: v4.19~499^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2546da99212f22034aecf279da9c47cbfac6c981;p=platform%2Fkernel%2Flinux-rpi.git crypto: af_alg - Initialize sg_num_bytes in error code path The RX SGL in processing is already registered with the RX SGL tracking list to support proper cleanup. The cleanup code path uses the sg_num_bytes variable which must therefore be always initialized, even in the error code path. Signed-off-by: Stephan Mueller Reported-by: syzbot+9c251bdd09f83b92ba95@syzkaller.appspotmail.com #syz test: https://github.com/google/kmsan.git master CC: #4.14 Fixes: e870456d8e7c ("crypto: algif_skcipher - overhaul memory management") Fixes: d887c52d6ae4 ("crypto: algif_aead - overhaul memory management") Signed-off-by: Herbert Xu --- diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 7846c0c..b52a14f 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -1156,8 +1156,10 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, /* make one iovec available as scatterlist */ err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); - if (err < 0) + if (err < 0) { + rsgl->sg_num_bytes = 0; return err; + } /* chain the new scatterlist with previous one */ if (areq->last_rsgl)