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atm: idt77252: prevent use after free in dequeue_rx()

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We can't dereference "skb" after calling vcc->push() because the skb
is released.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2024-08-09 15:28:19 +03:00 committed by David S. Miller
parent 484caf2076
commit a9a18e8f77
1 changed files with 5 additions and 4 deletions
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9
drivers/atm/idt77252.c
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@ -1118,8 +1118,8 @@ dequeue_rx(struct idt77252_dev *card, struct rsq_entry *rsqe)
rpp->len += skb->len; rpp->len += skb->len;
if (stat & SAR_RSQE_EPDU) { if (stat & SAR_RSQE_EPDU) {
unsigned int len, truesize;
unsigned char *l1l2; unsigned char *l1l2;
unsigned int len;
l1l2 = (unsigned char *) ((unsigned long) skb->data + skb->len - 6); l1l2 = (unsigned char *) ((unsigned long) skb->data + skb->len - 6);
@ -1189,14 +1189,15 @@ dequeue_rx(struct idt77252_dev *card, struct rsq_entry *rsqe)
ATM_SKB(skb)->vcc = vcc; ATM_SKB(skb)->vcc = vcc;
__net_timestamp(skb); __net_timestamp(skb);
truesize = skb->truesize;
vcc->push(vcc, skb); vcc->push(vcc, skb);
atomic_inc(&vcc->stats->rx); atomic_inc(&vcc->stats->rx);
if (skb->truesize > SAR_FB_SIZE_3) if (truesize > SAR_FB_SIZE_3)
add_rx_skb(card, 3, SAR_FB_SIZE_3, 1); add_rx_skb(card, 3, SAR_FB_SIZE_3, 1);
else if (skb->truesize > SAR_FB_SIZE_2) else if (truesize > SAR_FB_SIZE_2)
add_rx_skb(card, 2, SAR_FB_SIZE_2, 1); add_rx_skb(card, 2, SAR_FB_SIZE_2, 1);
else if (skb->truesize > SAR_FB_SIZE_1) else if (truesize > SAR_FB_SIZE_1)
add_rx_skb(card, 1, SAR_FB_SIZE_1, 1); add_rx_skb(card, 1, SAR_FB_SIZE_1, 1);
else else
add_rx_skb(card, 0, SAR_FB_SIZE_0, 1); add_rx_skb(card, 0, SAR_FB_SIZE_0, 1);