diff mbox series

[v5,5/8] lib: rsa: free local arrays after use in rsa_gen_key_prop()

Message ID 20200522141937.3523692-5-heiko@sntech.de
State New
Headers show
Series [v5,1/8] lib: rsa: distinguish between tpl and spl for CONFIG_RSA_VERIFY | expand

Commit Message

Heiko Stuebner May 22, 2020, 2:19 p.m. UTC 
From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>

n, rr and rrtmp are used for internal calculations, but in the end
the results are copied into separately allocated elements of the
actual key_prop, so the n, rr and rrtmp elements are not used anymore
when returning from the function and should of course be freed.

Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
---
changes in v4:
- new patch

 lib/rsa/rsa-keyprop.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

Comments

Heiko Stuebner May 25, 2020, 5:18 p.m. UTC | #1 
Am Freitag, 22. Mai 2020, 16:19:34 CEST schrieb Heiko Stuebner:
> From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
> 
> n, rr and rrtmp are used for internal calculations, but in the end
> the results are copied into separately allocated elements of the
> actual key_prop, so the n, rr and rrtmp elements are not used anymore
> when returning from the function and should of course be freed.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>

transplanting a tag from v4:
Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
diff mbox series

Patch

diff --git a/lib/rsa/rsa-keyprop.c b/lib/rsa/rsa-keyprop.c
index e28fbb7472..ac33b35ff9 100644
--- a/lib/rsa/rsa-keyprop.c
+++ b/lib/rsa/rsa-keyprop.c
@@ -655,7 +655,7 @@  int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
 	struct rsa_key rsa_key;
 	uint32_t *n = NULL, *rr = NULL, *rrtmp = NULL;
 	const int max_rsa_size = 4096;
-	int rlen, i, ret;
+	int rlen, i, ret = 0;
 
 	*prop = calloc(sizeof(**prop), 1);
 	n = calloc(sizeof(uint32_t), 1 + (max_rsa_size >> 5));
@@ -663,12 +663,12 @@  int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
 	rrtmp = calloc(sizeof(uint32_t), 1 + ((max_rsa_size * 2) >> 5));
 	if (!(*prop) || !n || !rr || !rrtmp) {
 		ret = -ENOMEM;
-		goto err;
+		goto out;
 	}
 
 	ret = rsa_parse_pub_key(&rsa_key, key, keylen);
 	if (ret)
-		goto err;
+		goto out;
 
 	/* modulus */
 	/* removing leading 0's */
@@ -678,7 +678,7 @@  int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
 	(*prop)->modulus = malloc(rsa_key.n_sz - i);
 	if (!(*prop)->modulus) {
 		ret = -ENOMEM;
-		goto err;
+		goto out;
 	}
 	memcpy((void *)(*prop)->modulus, &rsa_key.n[i], rsa_key.n_sz - i);
 
@@ -686,7 +686,7 @@  int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
 	(*prop)->public_exponent = calloc(1, sizeof(uint64_t));
 	if (!(*prop)->public_exponent) {
 		ret = -ENOMEM;
-		goto err;
+		goto out;
 	}
 	memcpy((void *)(*prop)->public_exponent + sizeof(uint64_t)
 						- rsa_key.e_sz,
@@ -710,16 +710,15 @@  int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
 	(*prop)->rr = malloc(rlen);
 	if (!(*prop)->rr) {
 		ret = -ENOMEM;
-		goto err;
+		goto out;
 	}
 	br_i32_encode((void *)(*prop)->rr, rlen, rr);
 
-	return 0;
-
-err:
+out:
 	free(n);
 	free(rr);
 	free(rrtmp);
-	rsa_free_key_prop(*prop);
+	if (ret < 0)
+		rsa_free_key_prop(*prop);
 	return ret;
 }