This is a note to let you know that I've just added the patch titled ASoC: SOF: debug: Fix a potential issue on string buffer termination to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: asoc-sof-debug-fix-a-potential-issue-on-string-buffe.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 46b205eb527e7c46784b569433050b55f11d241e Author: Hui Wang <hui.wang@xxxxxxxxxxxxx> Date: Mon Feb 8 18:38:57 2021 +0800 ASoC: SOF: debug: Fix a potential issue on string buffer termination [ Upstream commit 9037c3bde65d339017ef41d81cb58069ffc321d4 ] The function simple_write_to_buffer() doesn't add string termination at the end of buf, we need to handle it on our own. This change refers to the function tokenize_input() in debug.c and the function sof_dfsentry_trace_filter_write() in trace.c. Fixes: 091c12e1f50c ("ASoC: SOF: debug: add new debugfs entries for IPC flood test") Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx> Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210208103857.75705-1-hui.wang@xxxxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c index 5529e8eeca462..08726034ff090 100644 --- a/sound/soc/sof/debug.c +++ b/sound/soc/sof/debug.c @@ -135,7 +135,7 @@ 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); if (!string) return -ENOMEM;