The callback data passed by reference to the hook was allocated on stack
within the scope of the case statement. The compiler is free to reuse
any of that stack space whilst making the function call so we may end up
passing garbage into the callback.
References:
Bug 18451 - Xorg server 1.5.2 SEGV during XFixesGetCursorImage()
https://bugs.freedesktop.org/show_bug.cgi?id=18451
v2: Drop the unrelated hunk that snuck in when ammending the commit
message.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
6dae7f3792