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avcodec/v4l2_m2m: Avoid using intermediate buffer

Browse Source 
Up until now, v4l2_m2m would write via snprintf() into an intermediate
buffer and then copy from there (via strncpy()) to the end buffer. This
commit changes this by removing the intermediate buffer.

The call to strncpy() was actually of the form strncpy(dst, src,
strlen(src) + 1) which is unsafe in general, but safe in this instance
because dst and src were both of the same size and src was a proper
zero-terminated string. But this nevertheless led to a compiler warning
"‘strncpy’ specified bound depends on the length of the source argument
[-Wstringop-overflow=]" in GCC 9.2. strlen() was unnecessary anyway.

Reviewed-by: Andriy Gelman <andriy.gelman@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-03-03 05:20:05 +01:00 committed by James Almer
parent dc1c3c640d
commit 6ee7375ef5
1 changed files with 3 additions and 5 deletions
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8
libavcodec/v4l2_m2m.c
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@ -358,7 +358,6 @@ int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
{
int ret = AVERROR(EINVAL);
struct dirent *entry;
char node[PATH_MAX];
DIR *dirp;
V4L2m2mContext *s = priv->context;
@ -372,9 +371,8 @@ int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
if (strncmp(entry->d_name, "video", 5))
continue;
snprintf(node, sizeof(node), "/dev/%s", entry->d_name);
av_log(s->avctx, AV_LOG_DEBUG, "probing device %s\n", node);
strncpy(s->devname, node, strlen(node) + 1);
snprintf(s->devname, sizeof(s->devname), "/dev/%s", entry->d_name);
av_log(s->avctx, AV_LOG_DEBUG, "probing device %s\n", s->devname);
ret = v4l2_probe_driver(s);
if (!ret)
break;
@ -389,7 +387,7 @@ int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
return ret;
}
av_log(s->avctx, AV_LOG_INFO, "Using device %s\n", node);
av_log(s->avctx, AV_LOG_INFO, "Using device %s\n", s->devname);
return v4l2_configure_contexts(s);
}