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authorGerd Hoffmann <kraxel@redhat.com>2022-06-20 10:15:47 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-06-20 16:38:29 +0300
commit05b252cccb2e5c3f56119d25de684b4f810ba40a (patch)
tree3440116ce35993ffedcfa6067503574208e77062 /drivers/dma-buf
parenta111daf0c53ae91e71fd2bfe7497862d14132e3e (diff)
downloadlinux-05b252cccb2e5c3f56119d25de684b4f810ba40a.tar.xz
udmabuf: add back sanity check
Check vm_fault->pgoff before using it. When we removed the warning, we also removed the check. Fixes: 7b26e4e2119d ("udmabuf: drop WARN_ON() check.") Reported-by: zdi-disclosures@trendmicro.com Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/udmabuf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index e7330684d3b8..9631f2fd2faf 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -32,8 +32,11 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct udmabuf *ubuf = vma->vm_private_data;
+ pgoff_t pgoff = vmf->pgoff;
- vmf->page = ubuf->pages[vmf->pgoff];
+ if (pgoff >= ubuf->pagecount)
+ return VM_FAULT_SIGBUS;
+ vmf->page = ubuf->pages[pgoff];
get_page(vmf->page);
return 0;
}