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net: bpf: be friendly to kmemcheck

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Reported by Mikulas Patocka, kmemcheck currently barks out a
false positive since we don't have special kmemcheck annotation
for bitfields used in bpf_prog structure.

We currently have jited:1, len:31 and thus when accessing len
while CONFIG_KMEMCHECK enabled, kmemcheck throws a warning that
we're reading uninitialized memory.

As we don't need the whole bit universe for pages member, we
can just split it to u16 and use a bool flag for jited instead
of a bitfield.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann
2014-09-08 08:04:49 +02:00
committed by David S. Miller
parent 55309dd3d4
commit 286aad3c40
8 changed files with 10 additions and 10 deletions
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2
arch/sparc/net/bpf_jit_comp.c
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@@ -801,7 +801,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf];
if (image) {
bpf_flush_icache(image, image + proglen);
fp->bpf_func = (void *)image;
fp->jited = 1;
fp->jited = true;
}
out:
kfree(addrs);