[PATCH V1] accel/amdxdna: Validate command buffer payload count
From: Lizhi Hou
Date: Thu Feb 19 2026 - 16:20:03 EST
The count field in the command header is used to determine the valid
payload size. Verify that the valid payload does not exceed the remaining
buffer space.
Fixes: aac243092b70 ("accel/amdxdna: Add command execution")
Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
---
drivers/accel/amdxdna/amdxdna_ctx.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/accel/amdxdna/amdxdna_ctx.c b/drivers/accel/amdxdna/amdxdna_ctx.c
index d17aef89a0ad..cf4d3af67bf7 100644
--- a/drivers/accel/amdxdna/amdxdna_ctx.c
+++ b/drivers/accel/amdxdna/amdxdna_ctx.c
@@ -104,7 +104,10 @@ void *amdxdna_cmd_get_payload(struct amdxdna_gem_obj *abo, u32 *size)
if (size) {
count = FIELD_GET(AMDXDNA_CMD_COUNT, cmd->header);
- if (unlikely(count <= num_masks)) {
+ if (unlikely(count <= num_masks ||
+ count * sizeof(u32) +
+ offsetof(struct amdxdna_cmd, data[0]) >
+ abo->mem.size)) {
*size = 0;
return NULL;
}
--
2.34.1