[PATCH 5.14 806/849] 9p/net: fix missing error check in p9_check_errors

Greg Kroah-Hartman
2021-11-15T23:24:09Z

From: Dominique Martinet <asmadeus@codewreck.org>

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>
---
net/9p/client.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -539,6 +539,8 @@ static int p9_check_errors(struct p9_cli
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);