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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-09-19 16:00:11 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-10-01 09:45:03 +0400 |
| commit | b205ca572159ab9a617fc96e4659bc138064ca8e (patch) | |
| tree | 58c79755a243b608c6edd2903afb49a21b9a1070 /drivers/gpu/drm/i915/i915_gem_execbuffer.c | |
| parent | 955382f3895f644855b56893067b1b23c63893dd (diff) | |
| download | linux-b205ca572159ab9a617fc96e4659bc138064ca8e.tar.xz | |
drm/i915: Use unsigned for overflow checks in execbuf
There's actually no real risk since we already check for stricter
constraints earlier (using UINT_MAX / sizeof (struct
drm_i915_gem_exec_object2) as the limit). But in eb_create we use
signed integers, which steals a factor of 2. Luckily struct
drm_i915_gem_exec_object2 for this to not matter.
Still, be consistent and use unsigned integers.
Similar use unsinged integers when checking for overflows in the
relocation entry processing.
I've also added a new subtests to igt/gem_reloc_overflow to also
test for overflowing args->buffer_count values.
v2: Give the variables again tighter scope to make it clear that the
computation is purely local and doesn't leak out to the 2nd block.
Requested by Chris Wilson.
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_execbuffer.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_execbuffer.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index b87107e73c05..da23cfe3902b 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -48,15 +48,15 @@ eb_create(struct drm_i915_gem_execbuffer2 *args, struct i915_address_space *vm) struct eb_vmas *eb = NULL; if (args->flags & I915_EXEC_HANDLE_LUT) { - int size = args->buffer_count; + unsigned size = args->buffer_count; size *= sizeof(struct i915_vma *); size += sizeof(struct eb_vmas); eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY); } if (eb == NULL) { - int size = args->buffer_count; - int count = PAGE_SIZE / sizeof(struct hlist_head) / 2; + unsigned size = args->buffer_count; + unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2; BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head)); while (count > 2*size) count >>= 1; @@ -667,7 +667,7 @@ i915_gem_execbuffer_relocate_slow(struct drm_device *dev, bool need_relocs; int *reloc_offset; int i, total, ret; - int count = args->buffer_count; + unsigned count = args->buffer_count; if (WARN_ON(list_empty(&eb->vmas))) return 0; @@ -818,8 +818,8 @@ validate_exec_list(struct drm_i915_gem_exec_object2 *exec, int count) { int i; - int relocs_total = 0; - int relocs_max = INT_MAX / sizeof(struct drm_i915_gem_relocation_entry); + unsigned relocs_total = 0; + unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry); for (i = 0; i < count; i++) { char __user *ptr = to_user_ptr(exec[i].relocs_ptr); |