alsa - mem leak?

Question

I\'ve been chasing a memory leak (reported by \'valgrind --leak-check=yes\') and it appears to be coming from ALSA. This code has been in the free world for some time so I\'

Answer 1

Perhaps this will work (source):

diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c

--- a/src/pcm/pcm.c
+++ b/src/pcm/pcm.c
@@ -2171,7 +2171,12 @@ static int snd_pcm_open_conf(snd_pcm_t **pcmp, const char *name,
        if (open_func) {
                err = open_func(pcmp, name, pcm_root, pcm_conf, stream, mode);
                if (err >= 0) {
-                       (*pcmp)->open_func = open_func;
+                       if ((*pcmp)->open_func) {
+                               /* only init plugin (like empty, asym) */
+                               snd_dlobj_cache_put(open_func);
+                       } else {
+                               (*pcmp)->open_func = open_func;
+                       }
                        err = 0;
                } else {
                        snd_dlobj_cache_put(open_func);

I tried it myself, but to no avail. My core temp heats up ~10 °F, most likely due to similar memory leak. Here's some of what valgrind gave me, even after using the patch above:

    ==869== 16,272 bytes in 226 blocks are possibly lost in loss record 103 of 103
    ==869==    at 0x4C28E48: calloc (vg_replace_malloc.c:566)
    ==869==    by 0x5066E61: _snd_config_make (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5066F58: _snd_config_make_add (in /usr/lib64/libasound.so.2)
    ==869==    by 0x50673B9: parse_value (in /usr/lib64/libasound.so.2)
    ==869==    by 0x50675DE: parse_array_def (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067680: parse_array_defs (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067A8E: parse_def (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067BC7: parse_defs (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067A6F: parse_def (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067BC7: parse_defs (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067A6F: parse_def (in /usr/lib64/libasound.so.2)
    ==869==    by 0x5067BC7: parse_defs (in /usr/lib64/libasound.so.2)

The number of bytes lost just keeps going up and up.