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lib: improve sanity checks in stream_set_endp()

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* lib/stream.c: (stream_set_endp) Add checks to make sure that the
    supplied 'endp' is within the 'size' of the stream, and that the
    current read pointer 'getp' is not beyond the specified 'endp'.
This commit is contained in:
Avneesh Sachdev 2012-05-05 17:42:43 -07:00 committed by David Lamparter
parent b4154c145a
commit 4effc29fb1
1 changed files with 12 additions and 2 deletions
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14
lib/stream.c
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@ -219,13 +219,23 @@ stream_set_endp (struct stream *s, size_t pos)
{ {
STREAM_VERIFY_SANE(s); STREAM_VERIFY_SANE(s);
if (!GETP_VALID (s, pos)) if (!ENDP_VALID(s, pos))
{ {
STREAM_BOUND_WARN (s, "set endp"); STREAM_BOUND_WARN (s, "set endp");
pos = s->endp; return;
}
/*
* Make sure the current read pointer is not beyond the new endp.
*/
if (s->getp > pos)
{
STREAM_BOUND_WARN(s, "set endp");
return;
} }
s->endp = pos; s->endp = pos;
STREAM_VERIFY_SANE(s);
} }
/* Forward pointer. */ /* Forward pointer. */