[PATCH 2/2] habanalabs: validate packet id during CB parse

[Oded Gabbay]

From: Ofir Bitton <obitton@xxxxxxxxx>

During command buffer parsing, driver extracts packet id
from user buffer. Driver must validate this packet id, since it is
being used in order to extract information from internal structures.

Signed-off-by: Ofir Bitton <obitton@xxxxxxxxx>
Reviewed-by: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxxxx>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 35 +++++++++++++++++++++++++++
 drivers/misc/habanalabs/goya/goya.c   | 31 ++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 00a0a7238d81..9ed4989b6fd4 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -154,6 +154,29 @@ static const u16 gaudi_packet_sizes[MAX_PACKET_ID] = {
 	[PACKET_LOAD_AND_EXE]	= sizeof(struct packet_load_and_exe)
 };
 
+static inline bool validate_packet_id(enum packet_id id)
+{
+	switch (id) {
+	case PACKET_WREG_32:
+	case PACKET_WREG_BULK:
+	case PACKET_MSG_LONG:
+	case PACKET_MSG_SHORT:
+	case PACKET_CP_DMA:
+	case PACKET_REPEAT:
+	case PACKET_MSG_PROT:
+	case PACKET_FENCE:
+	case PACKET_LIN_DMA:
+	case PACKET_NOP:
+	case PACKET_STOP:
+	case PACKET_ARB_POINT:
+	case PACKET_WAIT:
+	case PACKET_LOAD_AND_EXE:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static const char * const
 gaudi_tpc_interrupts_cause[GAUDI_NUM_OF_TPC_INTR_CAUSE] = {
 	"tpc_address_exceed_slm",
@@ -3772,6 +3795,12 @@ static int gaudi_validate_cb(struct hl_device *hdev,
 				PACKET_HEADER_PACKET_ID_MASK) >>
 					PACKET_HEADER_PACKET_ID_SHIFT);
 
+		if (!validate_packet_id(pkt_id)) {
+			dev_err(hdev->dev, "Invalid packet id %u\n", pkt_id);
+			rc = -EINVAL;
+			break;
+		}
+
 		pkt_size = gaudi_packet_sizes[pkt_id];
 		cb_parsed_length += pkt_size;
 		if (cb_parsed_length > parser->user_cb_size) {
@@ -3995,6 +4024,12 @@ static int gaudi_patch_cb(struct hl_device *hdev,
 				PACKET_HEADER_PACKET_ID_MASK) >>
 					PACKET_HEADER_PACKET_ID_SHIFT);
 
+		if (!validate_packet_id(pkt_id)) {
+			dev_err(hdev->dev, "Invalid packet id %u\n", pkt_id);
+			rc = -EINVAL;
+			break;
+		}
+
 		pkt_size = gaudi_packet_sizes[pkt_id];
 		cb_parsed_length += pkt_size;
 		if (cb_parsed_length > parser->user_cb_size) {
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 85030759b2af..33cd2ae653d2 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -139,6 +139,25 @@ static u16 goya_packet_sizes[MAX_PACKET_ID] = {
 	[PACKET_STOP]		= sizeof(struct packet_stop)
 };
 
+static inline bool validate_packet_id(enum packet_id id)
+{
+	switch (id) {
+	case PACKET_WREG_32:
+	case PACKET_WREG_BULK:
+	case PACKET_MSG_LONG:
+	case PACKET_MSG_SHORT:
+	case PACKET_CP_DMA:
+	case PACKET_MSG_PROT:
+	case PACKET_FENCE:
+	case PACKET_LIN_DMA:
+	case PACKET_NOP:
+	case PACKET_STOP:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static u64 goya_mmu_regs[GOYA_MMU_REGS_NUM] = {
 	mmDMA_QM_0_GLBL_NON_SECURE_PROPS,
 	mmDMA_QM_1_GLBL_NON_SECURE_PROPS,
@@ -3455,6 +3474,12 @@ static int goya_validate_cb(struct hl_device *hdev,
 				PACKET_HEADER_PACKET_ID_MASK) >>
 					PACKET_HEADER_PACKET_ID_SHIFT);
 
+		if (!validate_packet_id(pkt_id)) {
+			dev_err(hdev->dev, "Invalid packet id %u\n", pkt_id);
+			rc = -EINVAL;
+			break;
+		}
+
 		pkt_size = goya_packet_sizes[pkt_id];
 		cb_parsed_length += pkt_size;
 		if (cb_parsed_length > parser->user_cb_size) {
@@ -3690,6 +3715,12 @@ static int goya_patch_cb(struct hl_device *hdev,
 				PACKET_HEADER_PACKET_ID_MASK) >>
 					PACKET_HEADER_PACKET_ID_SHIFT);
 
+		if (!validate_packet_id(pkt_id)) {
+			dev_err(hdev->dev, "Invalid packet id %u\n", pkt_id);
+			rc = -EINVAL;
+			break;
+		}
+
 		pkt_size = goya_packet_sizes[pkt_id];
 		cb_parsed_length += pkt_size;
 		if (cb_parsed_length > parser->user_cb_size) {
-- 
2.17.1