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Subject[PATCH v4] bluetooth: hci_qca: Fix QCA6390 memdump failure
Date
QCA6390 memdump VSE sometimes come to bluetooth driver
with wrong sequence number as illustrated as follows:
frame # in dec: frame data in hex
1396: ff fd 01 08 74 05 00 37 8f 14
1397: ff fd 01 08 75 05 00 ff bf 38
1414: ff fd 01 08 86 05 00 fb 5e 4b
1399: ff fd 01 08 77 05 00 f3 44 0a
1400: ff fd 01 08 78 05 00 ca f7 41
it is mistook for controller missing packets, so results
in page fault after overwriting memdump buffer allocated.

Fixed by ignoring QCA6390 sequence number check and
checking buffer space before writing.

Signed-off-by: Zijun Hu <zijuhu@codeaurora.org>
Tested-by: Zijun Hu <zijuhu@codeaurora.org>
---
Changes in v4:
- add a piece of code comments
Changes in v3:
- correct coding style
Changes in v2:
- rename a local variable from @temp to @rx_size

drivers/bluetooth/hci_qca.c | 49 ++++++++++++++++++++++++++++++++++++++-------
1 file changed, 42 insertions(+), 7 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index e4a6823..4acac13 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -114,6 +114,7 @@ struct qca_memdump_data {
char *memdump_buf_tail;
u32 current_seq_no;
u32 received_dump;
+ u32 ram_dump_size;
};

struct qca_memdump_event_hdr {
@@ -976,6 +977,8 @@ static void qca_controller_memdump(struct work_struct *work)
char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
u16 seq_no;
u32 dump_size;
+ u32 rx_size;
+ enum qca_btsoc_type soc_type = qca_soc_type(hu);

while ((skb = skb_dequeue(&qca->rx_memdump_q))) {

@@ -1029,6 +1032,7 @@ static void qca_controller_memdump(struct work_struct *work)

skb_pull(skb, sizeof(dump_size));
memdump_buf = vmalloc(dump_size);
+ qca_memdump->ram_dump_size = dump_size;
qca_memdump->memdump_buf_head = memdump_buf;
qca_memdump->memdump_buf_tail = memdump_buf;
}
@@ -1051,26 +1055,57 @@ static void qca_controller_memdump(struct work_struct *work)
* the controller. In such cases let us store the dummy
* packets in the buffer.
*/
+ /* For QCA6390, controller does not lost packets but
+ * sequence number field of packat sometimes has error
+ * bits, so skip this checking for missing packet.
+ */
while ((seq_no > qca_memdump->current_seq_no + 1) &&
+ (soc_type != QCA_QCA6390) &&
seq_no != QCA_LAST_SEQUENCE_NUM) {
bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
qca_memdump->current_seq_no);
+ rx_size = qca_memdump->received_dump;
+ rx_size += QCA_DUMP_PACKET_SIZE;
+ if (rx_size > qca_memdump->ram_dump_size) {
+ bt_dev_err(hu->hdev,
+ "QCA memdump received %d, no space for missed packet",
+ qca_memdump->received_dump);
+ break;
+ }
memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
qca_memdump->current_seq_no++;
}

- memcpy(memdump_buf, (unsigned char *) skb->data, skb->len);
- memdump_buf = memdump_buf + skb->len;
- qca_memdump->memdump_buf_tail = memdump_buf;
- qca_memdump->current_seq_no = seq_no + 1;
- qca_memdump->received_dump += skb->len;
+ rx_size = qca_memdump->received_dump + skb->len;
+ if (rx_size <= qca_memdump->ram_dump_size) {
+ if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
+ (seq_no != qca_memdump->current_seq_no))
+ bt_dev_err(hu->hdev,
+ "QCA memdump unexpected packet %d",
+ seq_no);
+ bt_dev_dbg(hu->hdev,
+ "QCA memdump packet %d with length %d",
+ seq_no, skb->len);
+ memcpy(memdump_buf, (unsigned char *)skb->data,
+ skb->len);
+ memdump_buf = memdump_buf + skb->len;
+ qca_memdump->memdump_buf_tail = memdump_buf;
+ qca_memdump->current_seq_no = seq_no + 1;
+ qca_memdump->received_dump += skb->len;
+ } else {
+ bt_dev_err(hu->hdev,
+ "QCA memdump received %d, no space for packet %d",
+ qca_memdump->received_dump, seq_no);
+ }
qca->qca_memdump = qca_memdump;
kfree_skb(skb);
if (seq_no == QCA_LAST_SEQUENCE_NUM) {
- bt_dev_info(hu->hdev, "QCA writing crash dump of size %d bytes",
- qca_memdump->received_dump);
+ bt_dev_info(hu->hdev,
+ "QCA memdump Done, received %d, total %d",
+ qca_memdump->received_dump,
+ qca_memdump->ram_dump_size);
memdump_buf = qca_memdump->memdump_buf_head;
dev_coredumpv(&hu->serdev->dev, memdump_buf,
qca_memdump->received_dump, GFP_KERNEL);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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