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gfs2: Fix underflow in gfs2_page_mkwrite
On filesystems with a block size smaller than PAGE_SIZE and non-empty
files smaller then PAGE_SIZE, gfs2_page_mkwrite could end up allocating
excess blocks beyond the end of the file, similar to fallocate. This
doesn't make sense; fix it.
Reported-by: Bob Peterson <rpeterso@redhat.com>
Fixes: 184b4e6085
("gfs2: Fix end-of-file handling in gfs2_page_mkwrite")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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1 changed files with 2 additions and 2 deletions
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@ -450,8 +450,8 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
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file_update_time(vmf->vma->vm_file);
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/* page is wholly or partially inside EOF */
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if (offset > size - PAGE_SIZE)
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length = offset_in_page(size);
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if (size - offset < PAGE_SIZE)
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length = size - offset;
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else
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length = PAGE_SIZE;
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