diff options
| author | Eric Paris <eparis@redhat.com> | 2010-11-12 08:26:06 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2010-11-12 08:26:06 +0100 |
| commit | ac5aa2e3332ec04889074afdbd1479424d0227a5 (patch) | |
| tree | f530e53b434f2ebcd89e93103d1e98aa41b2d372 | |
| parent | ipv4: netfilter: ip_tables: fix information leak to userland (diff) | |
| download | linux-ac5aa2e3332ec04889074afdbd1479424d0227a5.tar.xz linux-ac5aa2e3332ec04889074afdbd1479424d0227a5.zip | |
netfilter: NF_HOOK_COND has wrong conditional
The NF_HOOK_COND returns 0 when it shouldn't due to what I believe to be an
error in the code as the order of operations is not what was intended. C will
evalutate == before =. Which means ret is getting set to the bool result,
rather than the return value of the function call. The code says
if (ret = function() == 1)
when it meant to say:
if ((ret = function()) == 1)
Normally the compiler would warn, but it doesn't notice it because its
a actually complex conditional and so the wrong code is wrapped in an explict
set of () [exactly what the compiler wants you to do if this was intentional].
Fixing this means that errors when netfilter denies a packet get propagated
back up the stack rather than lost.
Problem introduced by commit 2249065f (netfilter: get rid of the grossness
in netfilter.h).
Signed-off-by: Eric Paris <eparis@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Patrick McHardy <kaber@trash.net>
| -rw-r--r-- | include/linux/netfilter.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 89341c32631a..03317c8d4077 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -215,7 +215,7 @@ NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, int ret; if (!cond || - (ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN) == 1)) + ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) ret = okfn(skb); return ret; } |