[PATCH] drm: shmem: Off by one in drm_gem_shmem_fault()

[Dan Carpenter]

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 at oracle.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 3750a982aaf6..1ee208c2c85e 100644
--- 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];
-- 
2.17.1