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It was possible for a reference to a frame which was part of a freed DSP to still be

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referenced, leading to memory corruption and eventual crashes. This code change ensures
that the dsp is freed when we are finished with the frame. This change is very similar
to a change Russell made with translators back a month or so ago.

(closes issue #11999)
Reported by: destiny6628
Patches:
      11999.patch uploaded by putnopvut (license 60)
Tested by: destiny6628, victoryure



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@114207 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Michelson
2008-04-17 16:28:03 +00:00
parent afdcdafb2b
commit 71b704ef78
3 changed files with 39 additions and 1 deletions
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4
include/asterisk/frame.h
View File

@@ -131,6 +131,10 @@ enum {
* The translator can not be free'd if the frame inside of it still has
* this flag set. */
AST_FRFLAG_FROM_TRANSLATOR = (1 << 1),
/*! This frame came from a dsp and is still the original frame.
* The dsp cannot be free'd if the frame inside of it still has
* this flag set. */
AST_FRFLAG_FROM_DSP = (1 << 2),
};
/*! \brief Data structure associated with a single frame of data

33
main/dsp.c
View File

@@ -1486,6 +1486,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_NULL;
ast_frfree(af);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
if ((dsp->features & DSP_FEATURE_BUSY_DETECT) && ast_dsp_busydetect(dsp)) {
@@ -1494,7 +1495,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
dsp->f.frametype = AST_FRAME_CONTROL;
dsp->f.subclass = AST_CONTROL_BUSY;
ast_frfree(af);
ast_log(LOG_DEBUG, "Requesting Hangup because the busy tone was detected on channel %s\n", chan->name);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
if ((dsp->features & DSP_FEATURE_DTMF_DETECT)) {
@@ -1516,6 +1517,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
if (chan)
ast_queue_frame(chan, af);
ast_frfree(af);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
} else {
@@ -1542,6 +1544,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
ast_queue_frame(chan, af);
ast_frfree(af);
}
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
} else {
memset(&dsp->f, 0, sizeof(dsp->f));
@@ -1559,6 +1562,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
if (chan)
ast_queue_frame(chan, af);
ast_frfree(af);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
}
@@ -1575,6 +1579,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
if (chan)
ast_queue_frame(chan, af);
ast_frfree(af);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
} else {
@@ -1588,6 +1593,7 @@ struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp,
if (chan)
ast_queue_frame(chan, af);
ast_frfree(af);
ast_set_flag(&dsp->f, AST_FRFLAG_FROM_DSP);
return &dsp->f;
}
}
@@ -1658,6 +1664,17 @@ void ast_dsp_set_features(struct ast_dsp *dsp, int features)
void ast_dsp_free(struct ast_dsp *dsp)
{
if (ast_test_flag(&dsp->f, AST_FRFLAG_FROM_DSP)) {
/* If this flag is still set, that means that the dsp's destruction
* been torn down, while we still have a frame out there being used.
* When ast_frfree() gets called on that frame, this ast_trans_pvt
* will get destroyed, too. */
/* Set the magic hint that this has been requested to be destroyed. */
dsp->freqcount = -1;
return;
}
free(dsp);
}
@@ -1786,3 +1803,17 @@ int ast_dsp_get_tcount(struct ast_dsp *dsp)
{
return dsp->tcount;
}
void ast_dsp_frame_freed(struct ast_frame *fr)
{
struct ast_dsp *dsp;
ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
dsp = (struct ast_dsp *) (((char *) fr) - offsetof(struct ast_dsp, f));
if (dsp->freqcount != -1)
return;
ast_dsp_free(dsp);
}

3
main/frame.c
View File

@@ -321,6 +321,8 @@ void ast_frame_free(struct ast_frame *fr, int cache)
{
if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR))
ast_translate_frame_freed(fr);
else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP))
ast_dsp_frame_freed(fr);
if (!fr->mallocd)
return;
@@ -370,6 +372,7 @@ struct ast_frame *ast_frisolate(struct ast_frame *fr)
void *newdata;
ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
if (!(fr->mallocd & AST_MALLOCD_HDR)) {
/* Allocate a new header if needed */