From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Thu, 18 May 2017 13:29:25 +0000 (+0300)
Subject: crypto: gcm - wait for crypto op not signal safe
X-Git-Tag: v3.2.93~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed64640fc387a764b18e2961dc9abd5dba22e313;p=pandora-kernel.git

crypto: gcm - wait for crypto op not signal safe

commit f3ad587070d6bd961ab942b3fd7a85d00dfc934b upstream.

crypto_gcm_setkey() was using wait_for_completion_interruptible() to
wait for completion of async crypto op but if a signal occurs it
may return before DMA ops of HW crypto provider finish, thus
corrupting the data buffer that is kfree'ed in this case.

Resolve this by using wait_for_completion() instead.

Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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