[PATCH] ASoC: wm_adsp: Use scnprintf() for the limited buffer output
snprintf() is a hard-to-use function, it's especially difficult to use it for concatenating substrings in a buffer with a limited size. Since snprintf() returns the would-be-output size, not the actual size, the subsequent use of snprintf() may point to the incorrect position.
Use scnprintf() instead for fixing such potential errors.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/soc/codecs/wm_adsp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c index d3d32b501aca..ffb9836e0538 100644 --- a/sound/soc/codecs/wm_adsp.c +++ b/sound/soc/codecs/wm_adsp.c @@ -1436,12 +1436,12 @@ static int wm_adsp_create_control(struct wm_adsp *dsp, subname = NULL; /* don't append subname */ break; case 2: - ret = snprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, + ret = scnprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s%c %.12s %x", dsp->name, *region_name, wm_adsp_fw_text[dsp->fw], alg_region->alg); break; default: - ret = snprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, + ret = scnprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s %.12s %x", dsp->name, wm_adsp_fw_text[dsp->fw], alg_region->alg); break;
On Fri, Mar 13, 2020 at 02:03:34PM +0100, Takashi Iwai wrote:
snprintf() is a hard-to-use function, it's especially difficult to use it for concatenating substrings in a buffer with a limited size. Since snprintf() returns the would-be-output size, not the actual size, the subsequent use of snprintf() may point to the incorrect position.
Use scnprintf() instead for fixing such potential errors.
Signed-off-by: Takashi Iwai tiwai@suse.de
Acked-by: Charles Keepax ckeepax@opensource.cirrus.com
Thanks, Charles
The patch
ASoC: wm_adsp: Use scnprintf() for the limited buffer output
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 578194290d0bf85b087e73e35ea74574012cfd96 Mon Sep 17 00:00:00 2001
From: Takashi Iwai tiwai@suse.de Date: Fri, 13 Mar 2020 14:03:34 +0100 Subject: [PATCH] ASoC: wm_adsp: Use scnprintf() for the limited buffer output
snprintf() is a hard-to-use function, it's especially difficult to use it for concatenating substrings in a buffer with a limited size. Since snprintf() returns the would-be-output size, not the actual size, the subsequent use of snprintf() may point to the incorrect position.
Use scnprintf() instead for fixing such potential errors.
Signed-off-by: Takashi Iwai tiwai@suse.de Acked-by: Charles Keepax ckeepax@opensource.cirrus.com Link: https://lore.kernel.org/r/20200313130334.9028-1-tiwai@suse.de Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/codecs/wm_adsp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c index 2a9b610f6d43..9e5b6c4ac475 100644 --- a/sound/soc/codecs/wm_adsp.c +++ b/sound/soc/codecs/wm_adsp.c @@ -1432,12 +1432,12 @@ static int wm_adsp_create_control(struct wm_adsp *dsp, subname = NULL; /* don't append subname */ break; case 2: - ret = snprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, + ret = scnprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s%c %.12s %x", dsp->name, *region_name, wm_adsp_fw_text[dsp->fw], alg_region->alg); break; default: - ret = snprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, + ret = scnprintf(name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN, "%s %.12s %x", dsp->name, wm_adsp_fw_text[dsp->fw], alg_region->alg); break;
participants (3)
-
Charles Keepax
-
Mark Brown
-
Takashi Iwai