[PATCH 4.19 236/323] 9p/net: fix missing error check in p9_check_errors

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>

commit 27eb4c3144f7a5ebef3c9a261d80cb3e1fa784dc upstream.

Link: https://lkml.kernel.org/r/99338965-d36c-886e-cd0e-1d8fff2b4746@xxxxxxxxx
Reported-by: syzbot+06472778c97ed94af66d@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/9p/client.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -553,6 +553,8 @@ 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);