diff options
| author | Ivan Vecera <ivecera@redhat.com> | 2013-11-06 14:02:36 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-07 19:09:44 -0500 |
| commit | 85aec73d595b8847f9c4ea571deb127913f0d508 (patch) | |
| tree | e4d2fcdd4cb1d6e1dd93f835cfc708e7476a4ed0 /drivers | |
| parent | 28fb96552472d8ef6197f6dc4c768cf8a64c570d (diff) | |
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: Ivan Vecera <ivecera@redhat.com>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index 819d87c281b..00c5be8c55b 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -6862,12 +6862,6 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget) pci_unmap_single(tp->pdev, dma_addr, skb_size, 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 * after the usage of the old DMA mapping. */ @@ -6875,6 +6869,12 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget) 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 { tg3_recycle_rx(tnapi, tpr, opaque_key, desc_idx, *post_ptr); |