On Fri, 25 Nov 2016 11:13:40 +0100, sutar.mounesh@gmail.com wrote:

From: Joshua Frkuska joshua_frkuska@mentor.com

In the case of dshare, dsnoop, and dmix when a device is opened twice and fails the second time, the semaphore is completely discarded. This creates dangling semaphore data.

This patch removes the possibility for the semaphore to be destroyed during a typical open failure by first checking if the shared memory can be destroyed or not. If the shared memory cannot be released it means both it and the semaphore are still in use and therefore the semaphore is just released.

Signed-off-by: Joshua Frkuska joshua_frkuska@mentor.com

Do you have some test code? It'd be great for checking the bug and avoiding regressions.

In anyway, the changes look good to me, so I applied it now.

thanks,

Takashi

---

src/pcm/pcm_dmix.c | 7 ++++--- src/pcm/pcm_dshare.c | 7 ++++--- src/pcm/pcm_dsnoop.c | 8 +++++--- 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c index 2bd5d39..b17f759 100644 --- a/src/pcm/pcm_dmix.c +++ b/src/pcm/pcm_dmix.c @@ -1128,9 +1128,10 @@ int snd_pcm_dmix_open(snd_pcm_t **pcmp, const char *name, snd_pcm_close(spcm); if (dmix->u.dmix.shmid_sum >= 0) shm_sum_discard(dmix);

• if (dmix->shmid >= 0)

• snd_pcm_direct_shm_discard(dmix);
  

• if (snd_pcm_direct_semaphore_discard(dmix) < 0)

• if ((dmix->shmid >= 0) && (snd_pcm_direct_shm_discard(dmix))) {

• if (snd_pcm_direct_semaphore_discard(dmix))
  

• 	snd_pcm_direct_semaphore_final(dmix, DIRECT_IPC_SEM_CLIENT);
  

• } else snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT); _err_nosem: if (dmix) {

diff --git a/src/pcm/pcm_dshare.c b/src/pcm/pcm_dshare.c index 5b32951..c080e7a 100644 --- a/src/pcm/pcm_dshare.c +++ b/src/pcm/pcm_dshare.c @@ -813,9 +813,10 @@ int snd_pcm_dshare_open(snd_pcm_t **pcmp, const char *name, snd_pcm_direct_client_discard(dshare); if (spcm) snd_pcm_close(spcm);

• if (dshare->shmid >= 0)

• snd_pcm_direct_shm_discard(dshare);
  

• if (snd_pcm_direct_semaphore_discard(dshare) < 0)

• if ((dshare->shmid >= 0) && (snd_pcm_direct_shm_discard(dshare))) {

• if (snd_pcm_direct_semaphore_discard(dshare))
  

• 	snd_pcm_direct_semaphore_final(dshare, DIRECT_IPC_SEM_CLIENT);
  

• } else snd_pcm_direct_semaphore_up(dshare, DIRECT_IPC_SEM_CLIENT); _err_nosem: if (dshare) {

diff --git a/src/pcm/pcm_dsnoop.c b/src/pcm/pcm_dsnoop.c index 055e4f4..74a3531 100644 --- a/src/pcm/pcm_dsnoop.c +++ b/src/pcm/pcm_dsnoop.c @@ -712,10 +712,12 @@ int snd_pcm_dsnoop_open(snd_pcm_t **pcmp, const char *name, snd_pcm_direct_client_discard(dsnoop); if (spcm) snd_pcm_close(spcm);

• if (dsnoop->shmid >= 0)

• snd_pcm_direct_shm_discard(dsnoop);
  

• if (snd_pcm_direct_semaphore_discard(dsnoop) < 0)

• if ((dsnoop->shmid >= 0) && (snd_pcm_direct_shm_discard(dsnoop))) {

• if (snd_pcm_direct_semaphore_discard(dsnoop))
  

• 	snd_pcm_direct_semaphore_final(dsnoop, DIRECT_IPC_SEM_CLIENT);
  

• } else snd_pcm_direct_semaphore_up(dsnoop, DIRECT_IPC_SEM_CLIENT);
• _err_nosem: if (dsnoop) { free(dsnoop->bindings);

-- 1.7.9.5