[PATCH] i40iw: avoid potential uninitialized variable use

From: Arnd Bergmann
Date: Wed Mar 23 2016 - 06:36:31 EST


gcc finds that the i40iw_make_cm_node() function in the recently added
i40iw driver uses an uninitilized variable as an index into an array
if CONFIG_IPV6 is disabled and the driver uses IPv6 mode:

drivers/infiniband/hw/i40iw/i40iw_cm.c: In function 'i40iw_make_cm_node':
drivers/infiniband/hw/i40iw/i40iw_cm.c:2206:52: error: 'arpindex' may be used uninitialized in this function [-Werror=maybe-uninitialized]
ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);

As far as I can tell, this code path can not be used because the ipv4
variable is always set with CONFIG_IPV6 is disabled, but it's better
to be sure and prevent the undefined behavior, as well as shut up
that warning in a proper way.

This adds an 'else' clause for the case we get the warning about,
causing the function to return an error in a controlled way.
To avoid adding extra mess with combined io()/#ifdef clauses,
I'm also converting the existing #ifdef into a more readable
if(IS_ENABLED()) check.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: f27b4746f378 ("i40iw: add connection management code")
---
drivers/infiniband/hw/i40iw/i40iw_cm.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c
index 92745d755272..38f917a6c778 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c
@@ -1992,7 +1992,6 @@ static int i40iw_addr_resolve_neigh(struct i40iw_device *iwdev,
/**
* i40iw_get_dst_ipv6
*/
-#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
struct sockaddr_in6 *dst_addr)
{
@@ -2008,7 +2007,6 @@ static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
dst = ip6_route_output(&init_net, NULL, &fl6);
return dst;
}
-#endif

/**
* i40iw_addr_resolve_neigh_ipv6 - resolve neighbor ipv6 address
@@ -2016,7 +2014,6 @@ static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
* @dst_ip: remote ip address
* @arpindex: if there is an arp entry
*/
-#if IS_ENABLED(CONFIG_IPV6)
static int i40iw_addr_resolve_neigh_ipv6(struct i40iw_device *iwdev,
u32 *src,
u32 *dest,
@@ -2089,7 +2086,6 @@ static int i40iw_addr_resolve_neigh_ipv6(struct i40iw_device *iwdev,
dst_release(dst);
return rc;
}
-#endif

/**
* i40iw_ipv4_is_loopback - check if loopback
@@ -2190,13 +2186,13 @@ static struct i40iw_cm_node *i40iw_make_cm_node(
cm_info->loc_addr[0],
cm_info->rem_addr[0],
oldarpindex);
-#if IS_ENABLED(CONFIG_IPV6)
- else
+ else if (IS_ENABLED(CONFIG_IPV6))
arpindex = i40iw_addr_resolve_neigh_ipv6(iwdev,
cm_info->loc_addr,
cm_info->rem_addr,
oldarpindex);
-#endif
+ else
+ arpindex = -EINVAL;
}
if (arpindex < 0) {
i40iw_pr_err("cm_node arpindex\n");
--
2.7.0