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netfilter: nf_flow_table_offload: Don't use offset uninitialized in flow_offload_port_{d,s}nat

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Clang warns (trimmed the second warning for brevity):

../net/netfilter/nf_flow_table_offload.c:342:2: warning: variable
'offset' is used uninitialized whenever switch default is taken
[-Wsometimes-uninitialized]
        default:
        ^~~~~~~
../net/netfilter/nf_flow_table_offload.c:346:57: note: uninitialized use
occurs here
        flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
                                                               ^~~~~~
../net/netfilter/nf_flow_table_offload.c:331:12: note: initialize the
variable 'offset' to silence this warning
        u32 offset;
                  ^
                   = 0

Match what was done in the flow_offload_ipv{4,6}_{d,s}nat functions and
just return in the default case, since port would also be uninitialized.

Fixes: c29f74e0df ("netfilter: nf_flow_table: hardware offload support")
Link: https://github.com/ClangBuiltLinux/linux/issues/780
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reported-by: kernelci.org bot <bot@kernelci.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Nathan Chancellor 2019-11-26 13:12:26 -07:00 committed by Pablo Neira Ayuso
parent e052901991
commit dc4d3f2e12
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nf_flow_table_offload.c
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@ -340,7 +340,7 @@ static void flow_offload_port_snat(struct net *net,
offset = 0; /* offsetof(struct tcphdr, dest); */
break;
default:
break;
return;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
@ -367,7 +367,7 @@ static void flow_offload_port_dnat(struct net *net,
offset = 0; /* offsetof(struct tcphdr, dest); */
break;
default:
break;
return;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,