metag/usercopy: Add early abort to copy_to_user

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commit fb8ea062a8 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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James Hogan 2017-03-31 13:35:01 +01:00 • committed by Greg Kroah-Hartman

parent 49a292dcd8

commit 4a93ac814d

1 changed files with 20 additions and 0 deletions

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arch/metag/lib/usercopy.c

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