From: Doug Ledford <dledford@redhat.com>
Date: Sat, 23 Apr 2016 00:14:58 +0000 (-0400)
Subject: IB/core: Fix oops in ib_cache_gid_set_default_gid
X-Git-Tag: v4.6-rc6~7^2~16
X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=f4e7de63ab273b6a5e35c82eb4fc6363c855ddd4;p=cascardo%2Flinux.git

IB/core: Fix oops in ib_cache_gid_set_default_gid

When we fail to find the default gid index, we can't continue
processing in this routine or else we will pass a negative
index to later routines resulting in invalid memory access
attempts and a kernel oops.

Fixes: 03db3a2d81e6 (IB/core: Add RoCE GID table management)
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index cb00d59da456..c2e257d97eff 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -691,7 +691,8 @@ void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
 			      NULL);
 
 		/* Coudn't find default GID location */
-		WARN_ON(ix < 0);
+		if (WARN_ON(ix < 0))
+			goto release;
 
 		zattr_type.gid_type = gid_type;