From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 19 Jun 2023 09:12:10 +0000 (+0200)
Subject: sfc: fix uninitialized variable use
X-Git-Tag: v6.6.7~2536^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f61d2d5cf142436cd1a02ddc78425e91116b8b0d;p=platform%2Fkernel%2Flinux-starfive.git

sfc: fix uninitialized variable use

The new efx_bind_neigh() function contains a broken code path when IPV6 is
disabled:

drivers/net/ethernet/sfc/tc_encap_actions.c:144:7: error: variable 'n' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
                if (encap->type & EFX_ENCAP_FLAG_IPV6) {
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc_encap_actions.c:184:8: note: uninitialized use occurs here
                if (!n) {
                     ^
drivers/net/ethernet/sfc/tc_encap_actions.c:144:3: note: remove the 'if' if its condition is always false
                if (encap->type & EFX_ENCAP_FLAG_IPV6) {
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/sfc/tc_encap_actions.c:141:22: note: initialize the variable 'n' to silence this warning
                struct neighbour *n;
                                   ^
                                    = NULL

Change it to use the existing error handling path here.

Fixes: 7e5e7d800011a ("sfc: neighbour lookup for TC encap action offload")
Suggested-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20230619091215.2731541-2-arnd@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/drivers/net/ethernet/sfc/tc_encap_actions.c b/drivers/net/ethernet/sfc/tc_encap_actions.c
index aac2595..7e8bcdb 100644
--- a/drivers/net/ethernet/sfc/tc_encap_actions.c
+++ b/drivers/net/ethernet/sfc/tc_encap_actions.c
@@ -164,6 +164,7 @@ static int efx_bind_neigh(struct efx_nic *efx,
 			 */
 			rc = -EOPNOTSUPP;
 			NL_SET_ERR_MSG_MOD(extack, "No IPv6 support (neigh bind)");
+			goto out_free;
 #endif
 		} else {
 			rt = ip_route_output_key(net, &flow4);