Am 2022-01-20 um 18:13 schrieb Philip Yang:
sizeof(buf) is 8 bytes because it is defined as unsigned char *buf,
each SMI event read only copy max 8 bytes to user buffer. Correct this
by using the buf allocate size.
Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
index 329a4c89f1e6..18ed1b72f0f7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -81,7 +81,8 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
struct kfd_smi_client *client = filep->private_data;
unsigned char *buf;
- buf = kmalloc_array(MAX_KFIFO_SIZE, sizeof(*buf), GFP_KERNEL);
+ size = min_t(size_t, size, MAX_KFIFO_SIZE);
+ buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
@@ -95,7 +96,7 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
ret = -EAGAIN;
goto ret_err;
}
- to_copy = min3(size, sizeof(buf), to_copy);
+ to_copy = min(size, to_copy);
ret = kfifo_out(&client->fifo, buf, to_copy);
spin_unlock(&client->lock);
if (ret <= 0) {
