Patch "atm: idt77252: prevent use after free in dequeue_rx()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     atm-idt77252-prevent-use-after-free-in-dequeue_rx.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b0c6fb4d3c40679e77f8a9b45c37042326a5249e
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date:   Fri Aug 9 15:28:19 2024 +0300

    atm: idt77252: prevent use after free in dequeue_rx()
    
    [ Upstream commit a9a18e8f770c9b0703dab93580d0b02e199a4c79 ]
    
    We can't dereference "skb" after calling vcc->push() because the skb
    is released.
    
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index 2daf50d4cd47a..7810f974b2ca9 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -1118,8 +1118,8 @@ dequeue_rx(struct idt77252_dev *card, struct rsq_entry *rsqe)
 	rpp->len += skb->len;
 
 	if (stat & SAR_RSQE_EPDU) {
+		unsigned int len, truesize;
 		unsigned char *l1l2;
-		unsigned int len;
 
 		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;
 		__net_timestamp(skb);
 
+		truesize = skb->truesize;
 		vcc->push(vcc, skb);
 		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);
-		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);
-		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);
 		else
 			add_rx_skb(card, 0, SAR_FB_SIZE_0, 1);




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