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net: packet socket packet_lookup_frame fix

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packet_lookup_frames() fails to get user frame if current frame header
status contains extra flags.
This is due to the wrong assumption on the operators precedence during
frame status tests.
Fixed by forcing the right operators precedence order with explicit brackets.

Signed-off-by: Paolo Abeni <paolo.abeni@gmail.com>
Signed-off-by: Sebastiano Di Paola <sebastiano.dipaola@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sebastiano Di Paola 2009-01-30 23:37:17 +00:00 committed by David S. Miller
parent 5d0932a5dd
commit f9e6934502
1 changed files with 4 additions and 4 deletions
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8
net/packet/af_packet.c
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@ -222,13 +222,13 @@ static void *packet_lookup_frame(struct packet_sock *po, unsigned int position,
h.raw = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size);
switch (po->tp_version) {
case TPACKET_V1:
if (status != h.h1->tp_status ? TP_STATUS_USER :
TP_STATUS_KERNEL)
if (status != (h.h1->tp_status ? TP_STATUS_USER :
TP_STATUS_KERNEL))
return NULL;
break;
case TPACKET_V2:
if (status != h.h2->tp_status ? TP_STATUS_USER :
TP_STATUS_KERNEL)
if (status != (h.h2->tp_status ? TP_STATUS_USER :
TP_STATUS_KERNEL))
return NULL;
break;
}