netdev - [PATCH] 9p: potential NULL dereference

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Message-ID: <20180926103934.GA14535@mwanda>
Date:   Wed, 26 Sep 2018 13:39:34 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Eric Van Hensbergen <ericvh@...il.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        "David S. Miller" <davem@...emloft.net>,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] 9p: potential NULL dereference

p9_tag_alloc() is supposed to return error pointers, but we accidentally
return a NULL here.  It would cause a NULL dereference in the caller.

Fixes: 996d5b4db4b1 ("9p: Use a slab for allocating requests")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/9p/client.c b/net/9p/client.c
index 47fa6158a75a..5f23e18eecc0 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -281,7 +281,7 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
 	int tag;
 
 	if (!req)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	if (p9_fcall_init(c, &req->tc, alloc_msize))
 		goto free_req;