tree add592e4f349cdd7d7cb585e167525b718cf14bb
parent 242005636d0897db166215ed09cf3832217df008
author Tobias Stoeckmann <tobias@stoeckmann.org> 1511901487 +0100
committer Pekka Paalanen <pekka.paalanen@collabora.co.uk> 1511941510 +0200

cursor: Fix heap overflows when parsing malicious files.

It is possible to trigger heap overflows due to an integer overflow
while parsing images.

The integer overflow occurs because the chosen limit 0x10000 for
dimensions is too large for 32 bit systems, because each pixel takes
4 bytes. Properly chosen values allow an overflow which in turn will
lead to less allocated memory than needed for subsequent reads.

See also: https://cgit.freedesktop.org/xorg/lib/libXcursor/commit/?id=4794b5dd34688158fb51a2943032569d3780c4b8
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=103961

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
[Pekka: add link to the corresponding libXcursor commit]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>