5.4-stable review patch. If anyone has any objections, please let me know.
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From: Manish Chopra manishc@marvell.com
commit 2f3389c73832ad90b63208c0fc281ad080114c7a upstream.
Driver allocates the LL2 rx buffers from kmalloc() area to construct the skb using slab_build_skb()
The required size allocation seems to have overlooked for accounting both skb_shared_info size and device placement padding bytes which results into the below panic when doing skb_put() for a standard MTU sized frame.
skbuff: skb_over_panic: text:ffffffffc0b0225f len:1514 put:1514 head:ff3dabceaf39c000 data:ff3dabceaf39c042 tail:0x62c end:0x566 dev:<NULL> … skb_panic+0x48/0x4a skb_put.cold+0x10/0x10 qed_ll2b_complete_rx_packet+0x14f/0x260 [qed] qed_ll2_rxq_handle_completion.constprop.0+0x169/0x200 [qed] qed_ll2_rxq_completion+0xba/0x320 [qed] qed_int_sp_dpc+0x1a7/0x1e0 [qed]
This patch fixes this by accouting skb_shared_info and device placement padding size bytes when allocating the buffers.
Cc: David S. Miller davem@davemloft.net Fixes: 0a7fb11c23c0 ("qed: Add Light L2 support") Signed-off-by: Manish Chopra manishc@marvell.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/qlogic/qed/qed_ll2.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c +++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c @@ -113,7 +113,10 @@ static void qed_ll2b_complete_tx_packet( static int qed_ll2_alloc_buffer(struct qed_dev *cdev, u8 **data, dma_addr_t *phys_addr) { - *data = kmalloc(cdev->ll2->rx_size, GFP_ATOMIC); + size_t size = cdev->ll2->rx_size + NET_SKB_PAD + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + + *data = kmalloc(size, GFP_ATOMIC); if (!(*data)) { DP_INFO(cdev, "Failed to allocate LL2 buffer data\n"); return -ENOMEM; @@ -2449,7 +2452,7 @@ static int qed_ll2_start(struct qed_dev INIT_LIST_HEAD(&cdev->ll2->list); spin_lock_init(&cdev->ll2->lock);
- cdev->ll2->rx_size = NET_SKB_PAD + ETH_HLEN + + cdev->ll2->rx_size = PRM_DMA_PAD_BYTES_NUM + ETH_HLEN + L1_CACHE_BYTES + params->mtu;
/* Allocate memory for LL2.