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[v3,11/11] crypto: dh - fix memleak in setkey

Message ID 1495545545-16872-12-git-send-email-tudor.ambarus@microchip.com (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show

Commit Message

Tudor Ambarus May 23, 2017, 1:19 p.m. UTC 
setkey can be called multiple times during the existence
of the transformation object. In case of multiple setkey calls,
the old key was not freed and we leaked memory.
Free the old MPI key if any.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
 crypto/dh.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/crypto/dh.c b/crypto/dh.c
index 3d35ba9..8eb433d 100644
--- a/crypto/dh.c
+++ b/crypto/dh.c
@@ -85,6 +85,9 @@  static int dh_set_secret(struct crypto_kpp *tfm, const void *buf,
 	struct dh_ctx *ctx = dh_get_ctx(tfm);
 	struct dh params;
 
+	/* Free the old MPI key if any */
+	dh_free_ctx(ctx);
+
 	if (crypto_dh_decode_key(buf, len, &params) < 0)
 		return -EINVAL;