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[S390] zcrypt: add sanity check before copy_from_user()
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 13 Jan 2010 19:44:43 +0000 (20:44 +0100)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Wed, 13 Jan 2010 19:44:46 +0000 (20:44 +0100)
It's not obvious that copy_from_user() is called with a sane length
parameter here. Even though it currently seems to be correct better
add a check to prevent stack corruption / exploits.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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