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authorDinghao Liu <dinghao.liu@zju.edu.cn>2021-01-10 16:02:53 +0800
committerMimi Zohar <zohar@linux.ibm.com>2021-01-13 07:22:12 -0500
commitccf11dbaa07b328fa469415c362d33459c140a37 (patch)
tree34c1acb7bb4be53c6899a9c7d2302747ad48b768 /security
parent7c53f6b671f4aba70ff15e1b05148b10d58c2837 (diff)
evm: Fix memleak in init_desc
tmp_tfm is allocated, but not freed on subsequent kmalloc failure, which leads to a memory leak. Free tmp_tfm. Fixes: d46eb3699502b ("evm: crypto hash replaced by shash") Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> [zohar@linux.ibm.com: formatted/reworded patch description] Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/evm/evm_crypto.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index 168c3b78ac47..a6dd47eb086d 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -73,7 +73,7 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo)
{
long rc;
const char *algo;
- struct crypto_shash **tfm, *tmp_tfm;
+ struct crypto_shash **tfm, *tmp_tfm = NULL;
struct shash_desc *desc;
if (type == EVM_XATTR_HMAC) {
@@ -118,13 +118,16 @@ unlock:
alloc:
desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(*tfm),
GFP_KERNEL);
- if (!desc)
+ if (!desc) {
+ crypto_free_shash(tmp_tfm);
return ERR_PTR(-ENOMEM);
+ }
desc->tfm = *tfm;
rc = crypto_shash_init(desc);
if (rc) {
+ crypto_free_shash(tmp_tfm);
kfree(desc);
return ERR_PTR(rc);
}