[PATCH -next] ALSA: pcm: replace simple_strtoul to kstrtoul

[Hongbo Li <lihongbo22@xxxxxxxxxx>]

As mentioned in [1], "...simple_strtol(), simple_strtoll(),
simple_strtoul(), and simple_strtoull() functions explicitly
ignore overflows, which may lead to unexpected results in callers."
Hence, the use of those functions is discouraged.

This patch replace the use of the simple_strtoul with the safer
alternatives kstrtoul.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#simple-strtol-simple-strtoll-simple-strtoul-simple-strtoull

Signed-off-by: Hongbo Li <lihongbo22@xxxxxxxxxx>
---
 sound/core/pcm_memory.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 8e4c68e3bbd0..fea8bed02604 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -185,6 +185,7 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
 	char line[64], str[64];
 	size_t size;
 	struct snd_dma_buffer new_dmab;
+	int ret;
 
 	guard(mutex)(&substream->pcm->open_mutex);
 	if (substream->runtime) {
@@ -193,8 +194,10 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
 	}
 	if (!snd_info_get_line(buffer, line, sizeof(line))) {
 		snd_info_get_str(str, line, sizeof(str));
-		size = simple_strtoul(str, NULL, 10) * 1024;
-		if ((size != 0 && size < 8192) || size > substream->dma_max) {
+		ret = kstrtoul(str, 10, &size);
+		size *= 1024;
+		if ((ret != 0) || (size != 0 && size < 8192) ||
+			size > substream->dma_max) {
 			buffer->error = -EINVAL;
 			return;
 		}
-- 
2.34.1