[PATCH net 1/1] net: stmmac: fix kernel panic due to NULL pointer dereference of buf->xdp
From: Song Yoong Siang <hidden>
Date: 2021-08-24 16:07:59
Also in:
bpf, lkml, netdev
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Ensure a valid XSK buffer before proceed to free the xdp buffer.
The following kernel panic is observed without this patch:
RIP: 0010:xp_free+0x5/0x40
Call Trace:
stmmac_napi_poll_rxtx+0x332/0xb30 [stmmac]
? stmmac_tx_timer+0x3c/0xb0 [stmmac]
net_rx_action+0x13d/0x3d0
__do_softirq+0xfc/0x2fb
? smpboot_register_percpu_thread+0xe0/0xe0
run_ksoftirqd+0x32/0x70
smpboot_thread_fn+0x1d8/0x2c0
kthread+0x169/0x1a0
? kthread_park+0x90/0x90
ret_from_fork+0x1f/0x30
---[ end trace 0000000000000002 ]---
Fixes: bba2556efad6 ("net: stmmac: Enable RX via AF_XDP zero-copy")
Cc: <redacted> # 5.13.x
Suggested-by: Ong Boon Leong <redacted>
Signed-off-by: Song Yoong Siang <redacted>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7b8404a21544..fa90bcdf4e45 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c@@ -4914,6 +4914,10 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue) prefetch(np); + /* Ensure a valid XSK buffer before proceed */ + if (!buf->xdp) + break; + if (priv->extend_desc) stmmac_rx_extended_status(priv, &priv->dev->stats, &priv->xstats,
@@ -4934,10 +4938,6 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue) continue; } - /* Ensure a valid XSK buffer before proceed */ - if (!buf->xdp) - break; - /* XSK pool expects RX frame 1:1 mapped to XSK buffer */ if (likely(status & rx_not_ls)) { xsk_buff_free(buf->xdp);
--
2.25.1
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