[PATCH] nvme-auth: Uninitialized variable in nvme_auth_transform_key()

Dan Carpenter
2022-07-18T11:11:08Z

A couple of the early error gotos call kfree_sensitive(transformed_key);
before "transformed_key" has been initialized.

Fixes: a476416bb57b ("nvme: implement In-Band authentication")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I wrote this several times in different ways, and kept on doing it
wrong so in the end I wrote it this way. It's a bigger diff, but I
think it's the clearest way to write it.

drivers/nvme/common/auth.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c
index bfb16fec0aed..1890193c7333 100644
--- a/drivers/nvme/common/auth.c
+++ b/drivers/nvme/common/auth.c
@@ -278,26 +278,33 @@ u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
shash->tfm = key_tfm;
ret = crypto_shash_setkey(key_tfm, key->key, key->len);
if (ret < 0)
- goto out_free_shash;
+ goto out_free_transformed_key;
ret = crypto_shash_init(shash);
if (ret < 0)
- goto out_free_shash;
+ goto out_free_transformed_key;
ret = crypto_shash_update(shash, nqn, strlen(nqn));
if (ret < 0)
- goto out_free_shash;
+ goto out_free_transformed_key;
ret = crypto_shash_update(shash, "NVMe-over-Fabrics", 17);
if (ret < 0)
- goto out_free_shash;
+ goto out_free_transformed_key;
ret = crypto_shash_final(shash, transformed_key);
+ if (ret < 0)
+ goto out_free_transformed_key;
+
+ kfree(shash);
+ crypto_free_shash(key_tfm);
+
+ return transformed_key;
+
+out_free_transformed_key:
+ kfree_sensitive(transformed_key);
out_free_shash:
kfree(shash);
out_free_key:
crypto_free_shash(key_tfm);
- if (ret < 0) {
- kfree_sensitive(transformed_key);
- return ERR_PTR(ret);
- }
- return transformed_key;
+
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(nvme_auth_transform_key);

--
2.35.1