Hi,
On Mon, 8 Feb 2021, Hui Wang wrote:
The function simple_write_to_buffer() doesn't add string termination at the end of buf, we need to add it on our own if calling that function to write the size of count chars to buf. This change refers to the function tokenize_input() in debug.c and the function sof_dfsentry_trace_filter_write() in trace.c.
[...]
--- a/sound/soc/sof/debug.c +++ b/sound/soc/sof/debug.c @@ -352,9 +352,10 @@ static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer, char *string; int ret;
- string = kzalloc(count, GFP_KERNEL);
- string = kzalloc(count+1, GFP_KERNEL);
ouch, good catch, thanks! We have this correct in soc/sof/trace.c, but not here. To keep up with kernel style, maybe:
+ string = kzalloc(count + 1, GFP_KERNEL);
if (!string) return -ENOMEM;
- string[count] = '\0';
kzalloc() returns zeros, so no need for this.
Br, Kai