| Message ID | 20220801165420.25978-2-tiwai@suse.de |
|---|---|
| State | Accepted |
| Commit | ca3b7b9dc9bc1fa552f4697b7cccfa0258a44d00 |
| Headers | show |
| Series | ASoC: Fix theoretical buffer overflow by snprintf() | expand |
On 2022-08-01 6:54 PM, Takashi Iwai wrote: > snprintf() returns the would-be-filled size when the string overflows > the given buffer size, hence using this value may result in a buffer > overflow (although it's unrealistic). > > This patch replaces it with a safer version, scnprintf() for papering > over such a potential issue. > > Fixes: f1b3b320bd65 ("ASoC: Intel: avs: Generic soc component driver") > Signed-off-by: Takashi Iwai <tiwai@suse.de> Acked-by: Cezary Rojewski <cezary.rojewski@intel.com>
diff --git a/sound/soc/intel/avs/pcm.c b/sound/soc/intel/avs/pcm.c index f21b0cdd3206..8fe5917b1e26 100644 --- a/sound/soc/intel/avs/pcm.c +++ b/sound/soc/intel/avs/pcm.c @@ -636,8 +636,8 @@ static ssize_t topology_name_read(struct file *file, char __user *user_buf, size char buf[64]; size_t len; - len = snprintf(buf, sizeof(buf), "%s/%s\n", component->driver->topology_name_prefix, - mach->tplg_filename); + len = scnprintf(buf, sizeof(buf), "%s/%s\n", component->driver->topology_name_prefix, + mach->tplg_filename); return simple_read_from_buffer(user_buf, count, ppos, buf, len); }
snprintf() returns the would-be-filled size when the string overflows the given buffer size, hence using this value may result in a buffer overflow (although it's unrealistic). This patch replaces it with a safer version, scnprintf() for papering over such a potential issue. Fixes: f1b3b320bd65 ("ASoC: Intel: avs: Generic soc component driver") Signed-off-by: Takashi Iwai <tiwai@suse.de> --- sound/soc/intel/avs/pcm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)