From: Jason Wang <jasow...@redhat.com>
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-sta...@nongnu.org
Reported-by: Daniel Shapira <dan...@twistlock.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
(cherry picked from commit b1d80d12c5f7ff081bb80ab4f4241d4248691192)
Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com>
---
hw/net/pcnet.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 0c44554168..d9ba04bdfc 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -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 */
--
2.17.1
