iomap: Fix overflow in iomap_page_mkwrite

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On architectures where loff_t is wider than pgoff_t, the expression
((page->index + 1) << PAGE_SHIFT) can overflow.  Rewrite to use the page
offset, which we already compute here anyway.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Andreas Gruenbacher 2019-11-07 07:28:18 -08:00 • committed by Darrick J. Wong

parent a901004214

commit add66fcbd3

1 changed files with 3 additions and 4 deletions

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fs/iomap/buffered-io.c

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