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res_fax: Fix a tight race condition causing fax to crash in audio fallback

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When T.38 gets rejected and G711 failback occurs there is a period of
time where neither AST_FAX_TECH_T38 nor AST_FAX_TECH_AUDIO is set,
leading to a crash.

Change-Id: Icc3f457b2292d48a9d7843dac0028347420cc982
This commit is contained in:
Torrey Searle
2016-09-29 20:08:07 +02:00
committed by Joshua Colp
parent 1ca148cae8
commit 20c3dba39e
1 changed files with 7 additions and 0 deletions
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7
res/res_fax.c
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@@ -1600,6 +1600,13 @@ static int generic_fax_exec(struct ast_channel *chan, struct ast_fax_session_det
chancount = 1;
/* Make sure one or the other is set to avoid race condition */
if (t38negotiated) {
details->caps |= AST_FAX_TECH_T38;
} else {
details->caps |= AST_FAX_TECH_AUDIO;
}
/* create the FAX session */
if (!(fax = fax_session_new(details, chan, reserved, token))) {
ast_log(LOG_ERROR, "Can't create a FAX session, FAX attempt failed.\n");