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net-ipv6: Fix alleged compiler warning in ipv6_exthdrs_len() 

It was reported that Commit 299603e837
("net-gro: Prepare GRO stack for the upcoming tunneling support")
triggered a compiler warning in ipv6_exthdrs_len():

net/ipv6/ip6_offload.c: In function ‘ipv6_gro_complete’:
net/ipv6/ip6_offload.c:178:24: warning: ‘optlen’ may be used uninitialized in this function [-Wmaybe-u
    opth = (void *)opth + optlen;
    			^
    net/ipv6/ip6_offload.c:164:22: note: ‘optlen’ was declared here
    int len = 0, proto, optlen;
                        ^
Note that there was no real bug here - optlen was never uninitialized
before use. (Was the version of gcc I used smarter to not complain?)

Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: H.K. Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jerry Chu 2013-12-15 18:48:07 -08:00 committed by David S. Miller
parent 7ed2a0d0d4
commit 810c23a355
1 changed files with 4 additions and 8 deletions
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12
net/ipv6/ip6_offload.c
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@ -160,8 +160,8 @@ out:
static int ipv6_exthdrs_len(struct ipv6hdr *iph,
const struct net_offload **opps)
{
struct ipv6_opt_hdr *opth = NULL;
int len = 0, optlen = 0, proto;
struct ipv6_opt_hdr *opth = (void *)iph;
int len = 0, proto, optlen = sizeof(*iph);
proto = iph->nexthdr;
for (;;) {
@ -172,12 +172,8 @@ static int ipv6_exthdrs_len(struct ipv6hdr *iph,
if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
break;
}
if (opth == NULL) {
opth = (void *)(iph+1);
} else {
optlen = ipv6_optlen(opth);
opth = (void *)opth + optlen;
}
opth = (void *)opth + optlen;
optlen = ipv6_optlen(opth);
len += optlen;
proto = opth->nexthdr;
}