From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
When the FW bundles multiple packets, pkt->act_len may be incorrect
as it refers to the first packet only (however, the FW will only
bundle packets that fit into the same pkt->alloc_len).
Before this patch, the skb length would be set (incorrectly) to
pkt->act_len in ath10k_sdio_mbox_rx_packet, and then later manually
adjusted in ath10k_sdio_mbox_rx_process_packet.
The first problem is that ath10k_sdio_mbox_rx_process_packet does not
use proper skb_put commands to adjust the length (it directly changes
skb->len), so we end up with a mismatch between skb->head + skb->tail
and skb->data + skb->len. This is quite serious, and causes corruptions
in the TCP stack, as the stack tries to coalesce packets, and relies
on skb->tail being correct (that is, skb_tail_pointer must point to
the first byte_after_ the data).
Instead of re-adjusting the size in ath10k_sdio_mbox_rx_process_packet,
this moves the code to ath10k_sdio_mbox_rx_packet, and also add a
bounds check, as skb_put would crash the kernel if not enough space is
available.
Tested with QCA6174 SDIO with firmware
WLAN.RMH.4.4.1-00007-QCARMSWP-1.
Fixes: 8530b4e7b22bc3b ("ath10k: sdio: set skb len for all rx packets")
Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Signed-off-by: Wen Gong <wgong@xxxxxxxxxxxxxx>
---
v2: no this patch
v3: new added
v4: change commit log
drivers/net/wireless/ath/ath10k/sdio.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index 8ed4fbd..1127e44 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -381,16 +381,11 @@ static int ath10k_sdio_mbox_rx_process_packet(struct ath10k *ar,
struct ath10k_htc_hdr *htc_hdr = (struct ath10k_htc_hdr *)skb->data;
bool trailer_present = htc_hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
enum ath10k_htc_ep_id eid;
- u16 payload_len;
u8 *trailer;
int ret;
- payload_len = le16_to_cpu(htc_hdr->len);
- skb->len = payload_len + sizeof(struct ath10k_htc_hdr);
-
if (trailer_present) {
- trailer = skb->data + sizeof(*htc_hdr) +
- payload_len - htc_hdr->trailer_len;
+ trailer = skb->data + skb->len - htc_hdr->trailer_len;
eid = pipe_id_to_eid(htc_hdr->eid);
@@ -632,13 +627,29 @@ static int ath10k_sdio_mbox_rx_packet(struct ath10k *ar,
{
struct ath10k_sdio *ar_sdio = ath10k_sdio_priv(ar);
struct sk_buff *skb = pkt->skb;
+ struct ath10k_htc_hdr *htc_hdr;
int ret;
ret = ath10k_sdio_readsb(ar, ar_sdio->mbox_info.htc_addr,
skb->data, pkt->alloc_len);
+
+ if (!ret) {
+ /* Update actual length. The original length may be incorrect,
+ * as the FW will bundle multiple packets as long as their sizes
+ * fit within the same aligned length (pkt->alloc_len).
+ */
+ htc_hdr = (struct ath10k_htc_hdr *)skb->data;
+ pkt->act_len = le16_to_cpu(htc_hdr->len) + sizeof(*htc_hdr);
+ if (pkt->act_len <= pkt->alloc_len) {
+ skb_put(skb, pkt->act_len);
+ } else {
+ ath10k_warn(ar, "rx packet too large (%zu > %zu)\n",
+ pkt->act_len, pkt->alloc_len);
+ ret = -EMSGSIZE;
+ }
+ }
+
pkt->status = ret;
- if (!ret)
- skb_put(skb, pkt->act_len);
return ret;
}
--
1.9.1
