Use-after-free (and double-free) in Jasper JPEG-200 (CVE-2015-5221)

[FEIST Josselin <josselin.feist () gmail com>]

Hi,

A new use-after-free was found in Jasper JPEG-200.

The use-after-free appears in the function mif_process_cmpt of the src/libjasper/mif/mif_cod.c file. Both tvp and 
tvp->buf are freed by jas_tvparser_destroy(tvp) (line 572), but if one of the two following branch conditions is taken 
(line 573/576), a second call to jas_tvparser_destroy(tvp) occurs (line 586). It is a use-after-free because before 
calling free in jas_tvparser_destroy there is a check to tvp->buf, while tvp could have been freed. Two double free 
take place just after this check (on tvp->buf and tvp). A simple fix  should be to move the first call of 
jas_tvparser_destroy after the two branch conditions (or set tvp to NULL after it has been freed in mif_process_cmpt).

The vulnerability was found by a static binary analysis using the tool gueb (that will become open-source soon).

Since another double-free in this library was found recently (http://seclists.org/oss-sec/2015/q3/366), maybe a patch 
could fix both of them ?

Best regards,
Feist Josselin