3.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ivan Vecera <ivecera@xxxxxxxxxx>
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 <nsujir@xxxxxxxxxxxx>
Cc: Michael Chan <mchan@xxxxxxxxxxxx>
Signed-off-by: Ivan Vecera <ivecera@xxxxxxxxxx>
Acked-by: Michael Chan <mchan@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/broadcom/tg3.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6848,12 +6848,6 @@ static int tg3_rx(struct tg3_napi *tnapi
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.
*/
@@ -6861,6 +6855,12 @@ static int tg3_rx(struct tg3_napi *tnapi
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);
--
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