The patch below does not apply to the 4.4-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 2420489bcb8910188578acc0c11c75445c2e4b92 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Mon, 14 Nov 2016 11:29:30 +0000
Subject: [PATCH] drm/i915: Don't touch NULL sg on
i915_gem_object_get_pages_gtt() error
On the DMA mapping error path, sg may be NULL (it has already been
marked as the last scatterlist entry), and we should avoid dereferencing
it again.
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: e227330223a7 ("drm/i915: avoid leaking DMA mappings")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: http://patchwork.freedesktop.org/patch/msgid/20161114112930.2033-1-chris@xxxxxxxxxxxxxxxxxx
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
(cherry picked from commit b17993b7b29612369270567643bcff814f4b3d7f)
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 91ab7e9d6d2e..00eb4814b913 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2268,7 +2268,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
page = shmem_read_mapping_page(mapping, i);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
- goto err_pages;
+ goto err_sg;
}
}
#ifdef CONFIG_SWIOTLB
@@ -2311,8 +2311,9 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
return 0;
-err_pages:
+err_sg:
sg_mark_end(sg);
+err_pages:
for_each_sgt_page(page, sgt_iter, st)
put_page(page);
sg_free_table(st);
--
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