Andy Getzendanner 77c1ff3982 vgaarb: fix incorrect dereference of userspace pointer. ... This patch corrects a userspace pointer dereference in the VGA arbiter in 2.6.32.1. copy_from_user() is used at line 822 to copy the contents of buf into kbuf, but a call to strncmp() on line 964 uses buf rather than kbuf. This problem led to a GPF in strncmp() when X was started on my x86_32 systems. X triggered the behavior with a write of "target PCI:0000:01:00.0" to /dev/vga_arbiter. The patch has been tested against 2.6.32.1 and observed to correct the GPF observed when starting X or manually writing the string "target PCI:0000:01:00.0" to /dev/vga_arbiter. Signed-off-by: Andy Getzendanner <james.getzendanner@students.olin.edu> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Airlie <airlied@redhat.com>		2010-02-11 14:04:48 +10:00
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vgaarb.c	vgaarb: fix incorrect dereference of userspace pointer.	2010-02-11 14:04:48 +10:00