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Message-Id: <1333717099-32679-1-git-send-email-xi.wang@gmail.com> Date: Fri, 6 Apr 2012 08:58:18 -0400 From: Xi Wang <xi.wang@...il.com> To: Keith Packard <keithp@...thp.com>, Daniel Vetter <daniel.vetter@...ll.ch> Cc: David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Xi Wang <xi.wang@...il.com> Subject: [PATCH 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2() A large args->buffer_count from userspace may overflow the allocation size, leading to out-of-bounds access. Use kmalloc_array() to avoid that. Signed-off-by: Xi Wang <xi.wang@...il.com> --- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index f51a696..19962bd 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1409,8 +1409,8 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data, return -EINVAL; } - exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count, - GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); + exec2_list = kmalloc_array(args->buffer_count, sizeof(*exec2_list), + GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); if (exec2_list == NULL) exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count); -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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