From: Kunwu Chan <chentao@xxxxxxxxxx>
Date: Sun, 19 Nov 2023 23:12:09 +0800
Hi Alexander,
Thank you so much for your reply, I looked at the modification you
mentioned, it's really cool. I'll definitely try it next time.
But when using it, will it be easy to forget to free up memory?
You have a kfree() at the end of the function.
Generally speaking, 'ka' stands for "[kernel] allocate" and you also
need to pass GPF_ as the second argument. Enough hints that you need to
free the pointer after using it I would say.
Although 'kmalloc_track_caller' is used, according to my understanding,
it is also necessary to release the memory at the end of use.
On 2023/11/15 23:39, Alexander Lobakin wrote:
From: Kunwu Chan <chentao@xxxxxxxxxx>
Date: Wed, 15 Nov 2023 11:14:44 +0800
The size of "i40e_dbg_command_buf" is 256, the size of "name"
depends on "IFNAMSIZ", plus a null character and format size,
the total size is more than 256, fix it.
Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
Suggested-by: Simon Horman <horms@xxxxxxxxxx>
---
drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
index 999c9708def5..e3b939c67cfe 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
@@ -72,7 +72,7 @@ static ssize_t i40e_dbg_command_read(struct file
*filp, char __user *buffer,
{
struct i40e_pf *pf = filp->private_data;
int bytes_not_copied;
- int buf_size = 256;
+ int buf_size = IFNAMSIZ + sizeof(i40e_dbg_command_buf) + 4;
Reverse Christmas Tree style? Should be the first one in the declaration
list.
char *buf;
int len;
You can fix it in a different way. Given that there's a kzalloc() either
way, why not allocate the precise required amount of bytes by using
kasprintf() instead of kzalloc() + snprintf()? You wouldn't need to
calculate any buffer sizes etc. this way.
Thanks,
Olek
Thanks,
Olek