From: Dominique Martinet <asmadeus@codewreck.org>
Date: Tue, 2 Nov 2021 10:47:47 +0000 (+0900)
Subject: 9p/net: fix missing error check in p9_check_errors
X-Git-Tag: v4.19.218~87
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=272717a19a1325b8b446bb0bdb74a53a685bf626;p=users%2Fdwmw2%2Flinux.git

9p/net: fix missing error check in p9_check_errors

commit 27eb4c3144f7a5ebef3c9a261d80cb3e1fa784dc upstream.

Link: https://lkml.kernel.org/r/99338965-d36c-886e-cd0e-1d8fff2b4746@gmail.com
Reported-by: syzbot+06472778c97ed94af66d@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/9p/client.c b/net/9p/client.c
index d62f83f93d7bb..bb0a43b8a6b0f 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -553,6 +553,8 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 		kfree(ename);
 	} else {
 		err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
+		if (err)
+			goto out_err;
 		err = -ecode;
 
 		p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);