dm crypt: use memzero_explicit for on-stack buffer
Use memzero_explicit to cleanup sensitive data allocated on stack
to prevent the compiler from optimizing and removing memset() calls.
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index cd15e08..ce11a90 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -711,7 +711,7 @@
for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
crypto_xor(data + i * 8, buf, 8);
out:
- memset(buf, 0, sizeof(buf));
+ memzero_explicit(buf, sizeof(buf));
return r;
}