40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
https://bugs.gentoo.org/559656
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https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg01199.html
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Subject: [PATCH] e1000: Avoid infinite loop in processing transmit descriptor
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Newsgroups: gmane.comp.emulators.qemu
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Date: 2015-09-04 16:21:06 GMT (2 days, 12 hours and 51 minutes ago)
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From: P J P <pjp@fedoraproject.org>
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While processing transmit descriptors, it could lead to an infinite
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loop if 'bytes' was to become zero; Add a check to avoid it.
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[The guest can force 'bytes' to 0 by setting the hdr_len and mss
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descriptor fields to 0.
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--Stefan]
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Signed-off-by: P J P <pjp@fedoraproject.org>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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---
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hw/net/e1000.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/net/e1000.c b/hw/net/e1000.c
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index 5c6bcd0..09c9e9d 100644
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--- a/hw/net/e1000.c
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+++ b/hw/net/e1000.c
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@@ -740,7 +740,8 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
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memmove(tp->data, tp->header, tp->hdr_len);
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tp->size = tp->hdr_len;
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}
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- } while (split_size -= bytes);
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+ split_size -= bytes;
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+ } while (bytes && split_size);
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} else if (!tp->tse && tp->cptse) {
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// context descriptor TSE is not set, while data descriptor TSE is set
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DBGOUT(TXERR, "TCP segmentation error\n");
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--
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2.4.3
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