metag/usercopy: Add early abort to copy_to_user

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When copying to userland on Meta, if any faults are encountered
immediately abort the copy instead of continuing on and repeatedly
faulting, and worse potentially copying further bytes successfully to
subsequent valid pages.

Fixes: 373cd784d0 ("metag: Memory handling")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Cc: stable@vger.kernel.org

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James Hogan 2017-03-31 13:35:01 +01:00

parent 2257211942

commit fb8ea062a8

1 changed files with 20 additions and 0 deletions

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arch/metag/lib/usercopy.c

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