linux-kernel - [PATCH] drm/i915: Uninitialized variable in i915_gem_object_map

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Date:   Thu, 24 Sep 2020 11:18:30 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Matthew Auld <matthew.auld@...el.com>,
        Abdiel Janulgue <abdiel.janulgue@...ux.intel.com>,
        Dave Airlie <airlied@...hat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/i915: Uninitialized variable in
 i915_gem_object_map_page()

The "i" iterator is never set to zero.  This probably doesn't affect
testing because GCC sometimes initializes variables and also we have a
new pluggin to initialize stack variables to zero.

Fixes: 7edd32a9e614 ("drm/i915: use vmap in i915_gem_object_map")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
Hi Andrew, this should probably go through the -mm tree and get folded
into the original patch.

 drivers/gpu/drm/i915/gem/i915_gem_pages.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 90029ea83aed..12bedabc1daa 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -266,6 +266,7 @@ static void *i915_gem_object_map_page(struct drm_i915_gem_object *obj,
 			return NULL;
 	}
 
+	i = 0;
 	for_each_sgt_page(page, iter, obj->mm.pages)
 		pages[i++] = page;
 	vaddr = vmap(pages, n_pages, 0, pgprot);
@@ -291,6 +292,7 @@ static void *i915_gem_object_map_pfn(struct drm_i915_gem_object *obj)
 			return NULL;
 	}
 
+	i = 0;
 	for_each_sgt_daddr(addr, iter, obj->mm.pages)
 		pfns[i++] = (iomap + addr) >> PAGE_SHIFT;
 	vaddr = vmap_pfn(pfns, n_pfn, pgprot_writecombine(PAGE_KERNEL_IO));
-- 
2.28.0