Commit 85aec73d authored by Ivan Vecera's avatar Ivan Vecera Committed by David S. Miller

tg3: avoid double-freeing of rx data memory

If build_skb fails the memory associated with the ring buffer is freed but
the ri->data member is not zeroed in this case. This causes a double-free
of this memory in tg3_free_rings->... path. The patch moves this block after
setting ri->data to NULL.
It would be nice to fix this bug also in stable >= v3.4 trees.

Cc: Nithin Nayak Sujir <nsujir@broadcom.com>
Cc: Michael Chan <mchan@broadcom.com>
Signed-off-by: default avatarIvan Vecera <ivecera@redhat.com>
Acked-by: default avatarMichael Chan <mchan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 28fb9655
...@@ -6862,12 +6862,6 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget) ...@@ -6862,12 +6862,6 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
pci_unmap_single(tp->pdev, dma_addr, skb_size, pci_unmap_single(tp->pdev, dma_addr, skb_size,
PCI_DMA_FROMDEVICE); PCI_DMA_FROMDEVICE);
skb = build_skb(data, frag_size);
if (!skb) {
tg3_frag_free(frag_size != 0, data);
goto drop_it_no_recycle;
}
skb_reserve(skb, TG3_RX_OFFSET(tp));
/* Ensure that the update to the data happens /* Ensure that the update to the data happens
* after the usage of the old DMA mapping. * after the usage of the old DMA mapping.
*/ */
...@@ -6875,6 +6869,12 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget) ...@@ -6875,6 +6869,12 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
ri->data = NULL; ri->data = NULL;
skb = build_skb(data, frag_size);
if (!skb) {
tg3_frag_free(frag_size != 0, data);
goto drop_it_no_recycle;
}
skb_reserve(skb, TG3_RX_OFFSET(tp));
} else { } else {
tg3_recycle_rx(tnapi, tpr, opaque_key, tg3_recycle_rx(tnapi, tpr, opaque_key,
desc_idx, *post_ptr); desc_idx, *post_ptr);
......
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