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Date:   Tue,  8 Sep 2020 12:23:30 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     ztong0001@...il.com
Subject: [PATCH] e1000e: do not panic on malformed rx_desc

length may be corrupted in rx_desc and lead to panic, so check the
sanity before passing it to skb_put

[  103.840572] skbuff: skb_over_panic: text:ffffffff8f432cc1 len:61585 put:61585 head:ffff88805642b800 data:ffff88805642b840 tail:0xf0d1 end:0x6c0 dev:e
th0
[  103.841283] ------------[ cut here ]------------
[  103.841515] kernel BUG at net/core/skbuff.c:109!
[  103.841749] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[  103.842063] CPU: 1 PID: 276 Comm: ping Tainted: G        W         5.8.0+ #4
[  103.842857] RIP: 0010:skb_panic+0xc4/0xc6
[  103.843022] Code: 89 f0 48 c7 c7 60 f2 3e 90 55 48 8b 74 24 18 4d 89 f9 56 48 8b 54 24 18 4c 89 e6 52 48 8b 44 24 18 4c 89 ea 50 e8 01 c5 2a ff <0f>
0b 4c 8b 64 24 18 e8 c1 b4 48 ff 48 c7 c1 e0 fc 3e 90 44 89 ee
[  103.843766] RSP: 0018:ffff88806d109c58 EFLAGS: 00010282
[  103.843976] RAX: 000000000000008c RBX: ffff8880683407c0 RCX: 0000000000000000
[  103.844262] RDX: 1ffff1100da24c91 RSI: 0000000000000008 RDI: ffffed100da2137e
[  103.844548] RBP: ffff88806bdcc000 R08: 000000000000008c R09: ffffed100da25cfb
[  103.844834] R10: ffff88806d12e7d7 R11: ffffed100da25cfa R12: ffffffff903efd20
[  103.845123] R13: ffffffff8f432cc1 R14: 000000000000f091 R15: ffff88805642b800
[  103.845410] FS:  00007efcd06852c0(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000
[  103.845734] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  103.845966] CR2: 00007efccf94f8dc CR3: 0000000064810000 CR4: 00000000000006e0
[  103.846254] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  103.846539] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  103.846823] Call Trace:
[  103.846925]  <IRQ>
[  103.847013]  ? e1000_clean_rx_irq+0x311/0x630
[  103.847190]  skb_put.cold+0x2b/0x4d
[  103.847334]  e1000_clean_rx_irq+0x311/0x630

Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 664e8ccc88d2..f12bd00b2dbf 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1047,6 +1047,10 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,
 			}
 			/* else just continue with the old one */
 		}
+		/* check length sanity */
+		if (skb->tail + length > skb->end) {
+			length = skb->end - skb->tail;
+		}
 		/* end copybreak code */
 		skb_put(skb, length);
 
-- 
2.25.1

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