The patch below does not apply to the 5.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 051c89cf4ac487e795d87e6f3b9e0ff788da8fb4 Mon Sep 17 00:00:00 2001 From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Date: Thu, 23 Jan 2020 12:59:34 +0000 Subject: [PATCH] drm/i915/gem: Detect overflow in calculating dumb buffer size MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To multiply 2 u32 numbers to generate a u64 in C requires a bit of forewarning for the compiler. Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20200123125934.1401755-1-chris@xxxxxxxxxxxxxxxxxx (cherry picked from commit 0f8f8a64300092852b9361cd835395ee71e6a7d6) Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 94f993e4c12f..c2de2f45b459 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -265,7 +265,10 @@ i915_gem_dumb_create(struct drm_file *file, DRM_FORMAT_MOD_LINEAR)) args->pitch = ALIGN(args->pitch, 4096); - args->size = args->pitch * args->height; + if (args->pitch < args->width) + return -EINVAL; + + args->size = mul_u32_u32(args->pitch, args->height); mem_type = INTEL_MEMORY_SYSTEM; if (HAS_LMEM(to_i915(dev)))
