diff mbox series

[5.12,030/700] gfs2: Fix underflow in gfs2_page_mkwrite

Message ID 20210712060928.899825908@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman July 12, 2021, 6:01 a.m. UTC 
From: Andreas Gruenbacher <agruenba@redhat.com>

commit d3c51c55cb9274dd43c156f1f26b5eb4d5f2d58c upstream.

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: 184b4e60853d ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/gfs2/file.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -474,8 +474,8 @@  static vm_fault_t gfs2_page_mkwrite(stru
 	file_update_time(vmf->vma->vm_file);
 
 	/* page is wholly or partially inside EOF */
-	if (offset > size - PAGE_SIZE)
-		length = offset_in_page(size);
+	if (size - offset < PAGE_SIZE)
+		length = size - offset;
 	else
 		length = PAGE_SIZE;