3.11.10.2 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Ivan Vecera <[email protected]> commit 85aec73d595b8847f9c4ea571deb127913f0d508 upstream. 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 <[email protected]> Cc: Michael Chan <[email protected]> Signed-off-by: Ivan Vecera <[email protected]> Acked-by: Michael Chan <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Luis Henriques <[email protected]> --- drivers/net/ethernet/broadcom/tg3.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index a04d2da..9f535de 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -6795,12 +6795,6 @@ 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. */ @@ -6808,6 +6802,12 @@ 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); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
