drm: shmem: Off by one in drm_gem_shmem_fault()

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: 2194a63a818d ("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

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 3750a98..1ee208c 100644 (file)
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -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];