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pcnet: fix possible buffer overflow

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In pcnet_receive(), we try to assign size_ to size which converts from
size_t to integer. This will cause troubles when size_ is greater
INT_MAX, this will lead a negative value in size and it can then pass
the check of size < MIN_BUF_SIZE which may lead out of bound access
for both buf and buf1.

Fixing by converting the type of size to size_t.

CC: qemu-stable@nongnu.org
Reported-by: Daniel Shapira <daniel@twistlock.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2018-05-30 12:11:30 +08:00
parent 1a326646fe
commit b1d80d12c5
1 changed files with 2 additions and 2 deletions
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4
hw/net/pcnet.c
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@ -988,14 +988,14 @@ ssize_t pcnet_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
uint8_t buf1[60];
int remaining;
int crc_err = 0;
int size = size_;
size_t size = size_;
if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size ||
(CSR_LOOP(s) && !s->looptest)) {
return -1;
}
#ifdef PCNET_DEBUG
printf("pcnet_receive size=%d\n", size);
printf("pcnet_receive size=%zu\n", size);
#endif
/* if too small buffer, then expand it */