[PATCH 4.19 18/72] 9p: potential NULL dereference

[Greg Kroah-Hartman]

[ Upstream commit 72ea0321088df2c41eca8cc6160c24bcceb56ac7 ]

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.

Link: http://lkml.kernel.org/m/20180926103934.GA14535@mwanda
Fixes: 996d5b4db4b1 ("9p: Use a slab for allocating requests")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Dominique Martinet <dominique.martinet@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/9p/client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index 4becde979462..b615aae5a0f8 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -287,7 +287,7 @@ 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;
-- 
2.20.1