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drm: shmem: Off by one in drm_gem_shmem_fault()

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The shmem->pages[] array has "num_pages" elements so the > should be >=
to prevent reading beyond the end of the array.  The shmem->pages[]
array is allocated in drm_gem_shmem_prime_import_sg_table().

Fixes: 2194a63a81 ("drm: Add library for shmem backed GEM objects")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322064125.GA12551@kadam
This commit is contained in:
Dan Carpenter 2019-03-22 09:41:25 +03:00 committed by Eric Anholt
parent 3051719af1
commit 3a3fe6e766
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_gem_shmem_helper.c
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@ -408,7 +408,7 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
loff_t num_pages = obj->size >> PAGE_SHIFT;
struct page *page;
if (vmf->pgoff > num_pages || WARN_ON_ONCE(!shmem->pages))
if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages))
return VM_FAULT_SIGBUS;
page = shmem->pages[vmf->pgoff];