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avutil/opt: Don't use NULL for %s string in a log message 

If one calls av_opt_set() with an incorrect string to set the value of
an option of type AV_OPT_TYPE_VIDEO_RATE, the given string is used in a
log message via %s. This also happens when the string is actually a
nullpointer in which case using it for %s is forbidden.

This commit changes this by erroring out early in case of a nullpointer.

This also fixes a warning from GCC 9.2:
"‘%s’ directive argument is null [-Wformat-overflow=]"

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-03-29 05:03:56 +02:00
parent edee0d0104
commit a500b975a8
1 changed files with 2 additions and 7 deletions
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9
libavutil/opt.c
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@ -330,12 +330,7 @@ static int set_string_image_size(void *obj, const AVOption *o, const char *val,
static int set_string_video_rate(void *obj, const AVOption *o, const char *val, AVRational *dst)
{
int ret;
if (!val) {
ret = AVERROR(EINVAL);
} else {
ret = av_parse_video_rate(dst, val);
}
int ret = av_parse_video_rate(dst, val);
if (ret < 0)
av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as video rate\n", val);
return ret;
@ -473,7 +468,7 @@ int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
return AVERROR_OPTION_NOT_FOUND;
if (!val && (o->type != AV_OPT_TYPE_STRING &&
o->type != AV_OPT_TYPE_PIXEL_FMT && o->type != AV_OPT_TYPE_SAMPLE_FMT &&
o->type != AV_OPT_TYPE_IMAGE_SIZE && o->type != AV_OPT_TYPE_VIDEO_RATE &&
o->type != AV_OPT_TYPE_IMAGE_SIZE &&
o->type != AV_OPT_TYPE_DURATION && o->type != AV_OPT_TYPE_COLOR &&
o->type != AV_OPT_TYPE_CHANNEL_LAYOUT && o->type != AV_OPT_TYPE_BOOL))
return AVERROR(EINVAL);