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demux: pad even 0-size demux packet data (fixes sd_ass crash) 

sd_ass relies on there being a zero byte after packet data. However
the packet allocation routines special-cased data length 0 and left
the data pointer as NULL in that case. This could cause a crash in
sd_ass if there was an empty subtitle packet. Change the allocation
routines to stop special-casing empty data and always allocate
padding. Empty packets are not so common that special casing them
would be a worthwhile optimization.

Also fix resize_demux_packet() to use MP_INPUT_BUFFER_PADDING SIZE as
the padding size, instead of a hardcoded value of 8.
This commit is contained in:
Uoti Urpala 2011-06-18 19:55:13 +03:00
parent 6d187a73f0
commit 38b55f8cef
1 changed files with 10 additions and 17 deletions
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9
libmpdemux/demuxer.c
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@ -195,14 +195,12 @@ struct demux_packet *new_demux_packet(size_t len)
dp->refcount = 1;
dp->master = NULL;
dp->buffer = NULL;
if (len > 0) {
dp->buffer = malloc(len + MP_INPUT_BUFFER_PADDING_SIZE);
if (!dp->buffer) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Memory allocation failure!\n");
abort();
}
memset(dp->buffer + len, 0, 8);
}
return dp;
}
@ -213,17 +211,12 @@ void resize_demux_packet(struct demux_packet *dp, size_t len)
"over 1 GB!\n");
abort();
}
if (len > 0) {
dp->buffer = realloc(dp->buffer, len + 8);
dp->buffer = realloc(dp->buffer, len + MP_INPUT_BUFFER_PADDING_SIZE);
if (!dp->buffer) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Memory allocation failure!\n");
abort();
}
memset(dp->buffer + len, 0, 8);
} else {
free(dp->buffer);
dp->buffer = NULL;
}
dp->len = len;
}