ASoC: SOF: debug: Fix a potential issue on string buffer termination

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@linux.intel.com>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20210208103857.75705-1-hui.wang@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c
index 30213a1beaaa28115179c5622c03cfdb011046d2..715a374b33cfb4670474d41d7f7b3e9fee16b4de 100644 (file)
--- a/sound/soc/sof/debug.c
+++ b/sound/soc/sof/debug.c
@@ -352,7 +352,7 @@ 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;