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qede: confirm skb is allocated before using

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qede_build_skb() assumes build_skb() always works and goes straight
to skb_reserve(). However, build_skb() can fail under memory pressure.
This results in a kernel panic because the skb to reserve is NULL.

Add a check in case build_skb() failed to allocate and return NULL.

The NULL return is handled correctly in callers to qede_build_skb().

Fixes: 8a8633978b ("qede: Add build_skb() support.")
Signed-off-by: Jamie Bainbridge <jamie.bainbridge@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamie Bainbridge 2022-04-06 21:19:19 +10:00 committed by David S. Miller
parent a3ebe92a0f
commit 4e910dbe36
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/qlogic/qede/qede_fp.c
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@ -748,6 +748,9 @@ qede_build_skb(struct qede_rx_queue *rxq,
buf = page_address(bd->data) + bd->page_offset;
skb = build_skb(buf, rxq->rx_buf_seg_size);
if (unlikely(!skb))
return NULL;
skb_reserve(skb, pad);
skb_put(skb, len);