net: macb: check TX ring before modifying skb

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macb_pad_and_fcs() replaces or extends the skb before the ring space
check. On NETDEV_TX_BUSY the stack requeues an skb that is already freed
or grown.

Check the ring first, using the padded length for the descriptor count.
Nonlinear skbs always take the copy path so the count can assume a
linear skb.

Fixes: 653e92a917 ("net: macb: add support for padding and fcs computation")
Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>
Link: https://patch.msgid.link/20261006-nb-macb-shared-skb-net-v1-1-a80641479041@tipi-net.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Nicolai Buchwitz 2026-10-06 07:41:32 +02:00 • committed by Jakub Kicinski

parent 7c24a4e87e

commit 6b48ed85ae

1 changed files with 46 additions and 30 deletions

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drivers/net/ethernet/cadence/macb_main.c

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