Commit edb251a7 authored by Committed by JehanBrowse files
Bug 739133 - (CVE-2017-17785) Heap overflow while parsing FLI files.
It is possible to trigger a heap overflow while parsing FLI files. The RLE decoder is vulnerable to out of boundary writes due to lack of boundary checks. The variable "framebuf" points to a memory area which was allocated with fli_header->width * fli_header->height bytes. The RLE decoder therefore must never write beyond that limit. If an illegal frame is detected, the parser won't stop, which means that the next valid sequence is properly parsed again. This should allow GIMP to parse FLI files as good as possible even if they are broken by an attacker or by accident. While at it, I changed the variable xc to be of type size_t, because the multiplication of width and height could overflow a 16 bit type. Signed-off-by: Tobias Stoeckmann <email@example.com>