31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
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References: bsc#962360 CVE-2015-7512
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Backends could provide a packet whose length is greater than buffer
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size. Check for this and truncate the packet to avoid rx buffer
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overflow in this case.
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Cc: Prasad J Pandit <address@hidden>
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Cc: address@hidden
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Signed-off-by: Jason Wang <address@hidden>
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---
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hw/net/pcnet.c | 6 ++++++
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1 file changed, 6 insertions(+)
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Index: xen-4.6.0-testing/tools/qemu-xen-dir-remote/hw/net/pcnet.c
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===================================================================
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--- xen-4.6.0-testing.orig/tools/qemu-xen-dir-remote/hw/net/pcnet.c
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+++ xen-4.6.0-testing/tools/qemu-xen-dir-remote/hw/net/pcnet.c
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@@ -1086,6 +1086,12 @@ ssize_t pcnet_receive(NetClientState *nc
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int pktcount = 0;
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if (!s->looptest) {
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+ if (size > 4092) {
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+#ifdef PCNET_DEBUG_RMD
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+ fprintf(stderr, "pcnet: truncates rx packet.\n");
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+#endif
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+ size = 4092;
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+ }
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memcpy(src, buf, size);
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/* no need to compute the CRC */
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src[size] = 0;
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