* [PATCH] drm: shmem: Off by one in drm_gem_shmem_fault()
@ 2019-03-22 6:41 Dan Carpenter
0 siblings, 0 replies; only message in thread
From: Dan Carpenter @ 2019-03-22 6:41 UTC (permalink / raw)
To: Maarten Lankhorst, Noralf Trønnes
Cc: Maxime Ripard, kernel-janitors, dri-devel, David Airlie, Sean Paul
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>
---
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
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