Merged revisions 337974 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

................
  r337974 | rmudgett | 2011-09-26 14:35:23 -0500 (Mon, 26 Sep 2011) | 37 lines
  
  Merged revisions 337973 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.8
  
  ........
    r337973 | rmudgett | 2011-09-26 14:30:39 -0500 (Mon, 26 Sep 2011) | 30 lines
    
    Fix deadlock when using dummy channels.
    
    Dummy channels created by ast_dummy_channel_alloc() should be destoyed by
    ast_channel_unref().  Using ast_channel_release() needlessly grabs the
    channel container lock and can cause a deadlock as a result.
    
    * Analyzed use of ast_dummy_channel_alloc() and made use
    ast_channel_unref() when done with the dummy channel.  (Primary reason for
    the reported deadlock.)
    
    * Made app_dial.c:dial_exec_full() not call ast_call() holding any channel
    locks.  Chan_local could not perform deadlock avoidance correctly.
    (Potential deadlock exposed by this issue.  Secondary reason for the
    reported deadlock since the held lock was part of the deadlock chain.)
    
    * Fixed some uses of ast_dummy_channel_alloc() not checking the returned
    channel pointer for failure.
    
    * Fixed some potential chan=NULL pointer usage in func_odbc.c.  Protected
    by testing the bogus_chan value.
    
    * Fixed needlessly clearing a 1024 char auto array when setting the first
    char to zero is enough in manager.c:action_getvar().
    
    (closes issue ASTERISK-18613)
    Reported by: Thomas Arimont
    Patches:
          jira_asterisk_18613_v1.8.patch (license #5621) patch uploaded by rmudgett
    Tested by: Thomas Arimont
  ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@337975 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 4 insertions, 2 deletions

diff --git a/apps/app_minivm.c b/apps/app_minivm.c
index 993a5a366..edffd4d3f 100644
--- a/apps/app_minivm.c
+++ b/apps/app_minivm.c
@@ -1313,6 +1313,9 @@ static int sendmail(struct minivm_template *template, struct minivm_account *vmu
 	}
 	/* Allocate channel used for chanvar substitution */
 	ast = ast_dummy_channel_alloc();
+	if (!ast) {
+		return -1;
+	}
 
 	snprintf(dur, sizeof(dur), "%d:%02d", duration / 60, duration % 60);
 
@@ -1473,8 +1476,7 @@ static int sendmail(struct minivm_template *template, struct minivm_account *vmu
 	ast_safe_system(tmp2);
 	ast_debug(1, "Sent message to %s with command '%s' - %s\n", vmu->email, global_mailcmd, template->attachment ? "(media attachment)" : "");
 	ast_debug(3, "Actual command used: %s\n", tmp2);
-	if (ast)
-		ast = ast_channel_release(ast);
+	ast = ast_channel_unref(ast);
 	ast_free(str1);
 	ast_free(str2);
 	return 0;