Created mingw-jasper tracking bugs for this issue:

Affects: fedora-all [bug 1388874]
Affects: epel-7 [bug 1388876]

Created jasper tracking bugs for this issue:

Affects: fedora-all [bug 1388873]
Affects: epel-5 [bug 1388875]

Upstream bug report:

https://github.com/mdadams/jasper/issues/30

The problem was in the jpc_dec_process_siz() function, which did not initialize tile->pi.  Later on, when tile data was freed, non-NULL tile->pi led to the call of jpc_pi_destroy() function, which dereferenced and possibly tried to free uninitialized / invalid pointer.  That could cause crash, or could possibly lead to use-after-free or double free.

This issue did not affect jasper packages in Red Hat Enterprise Linux 6 and 7 because of the inclusion of the CVE-2008-3520 fix in those packages.  The patch makes jpc_dec_process_siz() function use calloc instead of malloc when allocating dec->tiles memory, using this change:

-    if (!(dec->tiles = jas_malloc(dec->numtiles * sizeof(jpc_dec_tile_t)))) {
+    if (!(dec->tiles = jas_calloc(dec->numtiles, sizeof(jpc_dec_tile_t)))) {

This was meant to protect against integer overflow when computing the amount of required memory allocation, but also has a side effect of initializing tile structure with zeros.  I.e. tile->pi is initialized to 0 / NULL, which is equivalent to the upstream fix for this issue.

This fix was also included in netpbm packages updates in Red Hat Enterprise Linux 4 and 5 via RHSA-2009:0012:

https://rhn.redhat.com/errata/RHSA-2009-0012.html