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asterisk: Audit locking of channel when manipulating flags.

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When manipulating flags on a channel the channel has to be
locked to guarantee that nothing else is also manipulating
the flags. This change introduces locking where necessary to
guarantee this. It also adds helper functions that manipulate
channel flags and lock to reduce repeated code.

ASTERISK-26789

Change-Id: I489280662dba0f4c50981bfc5b5a7073fef2db10
This commit is contained in:
Joshua Colp
2017-05-13 16:40:00 +00:00
parent ce4d8dac91
commit 5a7af00e80
15 changed files with 95 additions and 55 deletions
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16
apps/app_chanspy.c
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@@ -693,9 +693,7 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
}
}
ast_channel_lock(chan);
ast_set_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY);
ast_channel_unlock(chan);
ast_channel_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
csth.volfactor = *volfactor;
@@ -825,9 +823,7 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
else
ast_deactivate_generator(chan);
ast_channel_lock(chan);
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY);
ast_channel_unlock(chan);
ast_channel_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
ast_audiohook_lock(&csth.whisper_audiohook);
@@ -921,7 +917,7 @@ static int common_exec(struct ast_channel *chan, struct ast_flags *flags,
if (ast_channel_state(chan) != AST_STATE_UP)
ast_answer(chan);
ast_set_flag(ast_channel_flags(chan), AST_FLAG_SPYING); /* so nobody can spy on us while we are spying */
ast_channel_set_flag(chan, AST_FLAG_SPYING);
waitms = 100;
@@ -934,7 +930,7 @@ static int common_exec(struct ast_channel *chan, struct ast_flags *flags,
if (!res)
res = ast_waitstream(chan, "");
else if (res < 0) {
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_SPYING);
ast_channel_clear_flag(chan, AST_FLAG_SPYING);
break;
}
if (!ast_strlen_zero(exitcontext)) {
@@ -977,7 +973,7 @@ static int common_exec(struct ast_channel *chan, struct ast_flags *flags,
res = ast_waitfordigit(chan, waitms);
if (res < 0) {
iter = ast_channel_iterator_destroy(iter);
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_SPYING);
ast_channel_clear_flag(chan, AST_FLAG_SPYING);
break;
}
if (!ast_strlen_zero(exitcontext)) {
@@ -1196,7 +1192,7 @@ static int common_exec(struct ast_channel *chan, struct ast_flags *flags,
}
exit:
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_SPYING);
ast_channel_clear_flag(chan, AST_FLAG_SPYING);
ast_channel_setoption(chan, AST_OPTION_TXGAIN, &zero_volume, sizeof(zero_volume), 0);