ALSA: hda - Fix and neaten print_nid_path/debug_badness
print_nid_path has a possible buffer overflow if
struct nid_path.path values are > 256.
Avoid this and neaten the output to remove the leading ':'
Neaten debug_badness to always verify arguments.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index a24c7b2..b956449 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -350,16 +350,16 @@
const char *pfx, struct nid_path *path)
{
char buf[40];
+ char *pos = buf;
int i;
+ *pos = 0;
+ for (i = 0; i < path->depth; i++)
+ pos += scnprintf(pos, sizeof(buf) - (pos - buf), "%s%02x",
+ pos != buf ? ":" : "",
+ path->path[i]);
- buf[0] = 0;
- for (i = 0; i < path->depth; i++) {
- char tmp[4];
- sprintf(tmp, ":%02x", path->path[i]);
- strlcat(buf, tmp, sizeof(buf));
- }
- codec_dbg(codec, "%s path: depth=%d %s\n", pfx, path->depth, buf);
+ codec_dbg(codec, "%s path: depth=%d '%s'\n", pfx, path->depth, buf);
}
/* called recursively */
@@ -1700,9 +1700,11 @@
#define DEBUG_BADNESS
#ifdef DEBUG_BADNESS
-#define debug_badness(fmt, args...) codec_dbg(codec, fmt, ##args)
+#define debug_badness(fmt, ...) \
+ codec_dbg(codec, fmt, ##__VA_ARGS__)
#else
-#define debug_badness(...)
+#define debug_badness(fmt, ...) \
+ do { if (0) codec_dbg(codec, fmt, ##__VA_ARGS__); } while (0)
#endif
#ifdef DEBUG_BADNESS