File hw-net-e1000e-advance-desc_offset-in-cas.patch of Package qemu.22427
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Wed, 11 Nov 2020 18:36:36 +0530
Subject: hw/net/e1000e: advance desc_offset in case of null descriptor
Git-commit: c2cb511634012344e3d0fe49a037a33b12d8a98a
References: bsc#1179468, CVE-2020-28916
While receiving packets via e1000e_write_packet_to_guest() routine,
'desc_offset' is advanced only when RX descriptor is processed. And
RX descriptor is not processed if it has NULL buffer address.
This may lead to an infinite loop condition. Increament 'desc_offset'
to process next descriptor in the ring to avoid infinite loop.
Reported-by: Cheol-woo Myung <330cjfdn@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
hw/net/e1000e_core.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
index 9b76f82db5b83ed611f5007da009..166054f2e3f65159e28caecf2609 100644
--- a/hw/net/e1000e_core.c
+++ b/hw/net/e1000e_core.c
@@ -1596,13 +1596,13 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct NetRxPkt *pkt,
(const char *) &fcs_pad, e1000x_fcs_len(core->mac));
}
}
- desc_offset += desc_size;
- if (desc_offset >= total_size) {
- is_last = true;
- }
} else { /* as per intel docs; skip descriptors with null buf addr */
trace_e1000e_rx_null_descriptor();
}
+ desc_offset += desc_size;
+ if (desc_offset >= total_size) {
+ is_last = true;
+ }
e1000e_write_rx_descr(core, desc, is_last ? core->rx_pkt : NULL,
rss_info, do_ps ? ps_hdr_len : 0, &bastate.written);