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udmabuf: add back sanity check
Check vm_fault->pgoff before using it. When we removed the warning, we
also removed the check.
Fixes: 7b26e4e211
("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>
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1 changed files with 4 additions and 1 deletions
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@ -32,8 +32,11 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct udmabuf *ubuf = vma->vm_private_data;
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pgoff_t pgoff = vmf->pgoff;
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vmf->page = ubuf->pages[vmf->pgoff];
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if (pgoff >= ubuf->pagecount)
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return VM_FAULT_SIGBUS;
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vmf->page = ubuf->pages[pgoff];
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get_page(vmf->page);
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return 0;
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}
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