[Asterisk-code-review] audiohook.c: Fix freeing a frame and still using it. (asterisk[15])

[Richard Mudgett]

Richard Mudgett has uploaded this change for review. ( https://gerrit.asterisk.org/7232


Change subject: audiohook.c: Fix freeing a frame and still using it.
......................................................................

audiohook.c: Fix freeing a frame and still using it.

Memory corruption happened to the media frame caches when an audio hook
freed a frame when it shouldn't.  I think the freed frame was because a
jitter buffer interpolated a missing frame and the audio hook
unconditionally freed it.

* Made audiohook.c:audio_audiohook_write_list() not free an interpolated
frame if it is the same frame as what was passed into the routine.

* Made plc.c:normalise_history() use memmove() instead of memcpy() on a
memory block that could overlap.  Found by valgrind investigating this
issue.

ASTERISK-27238
ASTERISK-27412

Change-Id: I548d86894281fc4529aefeb9f161f2131ecc6fde
---
M main/audiohook.c
M main/plc.c
2 files changed, 4 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/32/7232/1

diff --git a/main/audiohook.c b/main/audiohook.c
index 2cba2de..04a379f 100644
--- a/main/audiohook.c
+++ b/main/audiohook.c
@@ -950,7 +950,9 @@
 	 * rely on actual media being present to do things.
 	 */
 	if (!middle_frame->data.ptr) {
-		ast_frfree(middle_frame);
+		if (middle_frame != start_frame) {
+			ast_frfree(middle_frame);
+		}
 		return start_frame;
 	}
 
diff --git a/main/plc.c b/main/plc.c
index b649357..739f727 100644
--- a/main/plc.c
+++ b/main/plc.c
@@ -96,7 +96,7 @@
 	if (s->buf_ptr == 0)
 		return;
 	memcpy(tmp, s->history, sizeof(int16_t)*s->buf_ptr);
-	memcpy(s->history, s->history + s->buf_ptr, sizeof(int16_t) * (PLC_HISTORY_LEN - s->buf_ptr));
+	memmove(s->history, s->history + s->buf_ptr, sizeof(int16_t) * (PLC_HISTORY_LEN - s->buf_ptr));
 	memcpy(s->history + PLC_HISTORY_LEN - s->buf_ptr, tmp, sizeof(int16_t) * s->buf_ptr);
 	s->buf_ptr = 0;
 }

-- 
To view, visit https://gerrit.asterisk.org/7232
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Gerrit-Project: asterisk
Gerrit-Branch: 15
Gerrit-MessageType: newchange
Gerrit-Change-Id: I548d86894281fc4529aefeb9f161f2131ecc6fde
Gerrit-Change-Number: 7232
Gerrit-PatchSet: 1
Gerrit-Owner: Richard Mudgett <rmudgett at digium.com>
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