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splice: Apply generic position and size checks to each write
We need to check the position and size of file writes against various limits, using generic_write_check(). This was not being done for the splice write path. It was fixed upstream by commit 8d0207652cbe ("->splice_write() via ->write_iter()") but we can't apply that. CVE-2014-7822 Change-Id: I439d0c0c1803b1bf0f0971dc1418529dd6929c41 Signed-off-by: Ben Hutchings <firstname.lastname@example.org>
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