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Subject[PATCH] security:trusted_tpm2: Fix memory leak in tpm2_key_encode()
Date
tpm2_key_encode() allocates a memory chunk from scratch with kmalloc(),
but it is never freed, which leads to a memory leak. Free the memory
chunk with kfree() in the return path.

Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
---
security/keys/trusted-keys/trusted_tpm2.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 0165da386289..dc9efd6c8b14 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -57,8 +57,10 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
unsigned char bool[3], *w = bool;
/* tag 0 is emptyAuth */
w = asn1_encode_boolean(w, w + sizeof(bool), true);
- if (WARN(IS_ERR(w), "BUG: Boolean failed to encode"))
+ if (WARN(IS_ERR(w), "BUG: Boolean failed to encode")) {
+ kfree(scratch);
return PTR_ERR(w);
+ }
work = asn1_encode_tag(work, end_work, 0, bool, w - bool);
}

@@ -69,8 +71,10 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
* trigger, so if it does there's something nefarious going on
*/
if (WARN(work - scratch + pub_len + priv_len + 14 > SCRATCH_SIZE,
- "BUG: scratch buffer is too small"))
+ "BUG: scratch buffer is too small")) {
+ kfree(scratch);
return -EINVAL;
+ }

work = asn1_encode_integer(work, end_work, options->keyhandle);
work = asn1_encode_octet_string(work, end_work, pub, pub_len);
@@ -79,8 +83,10 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
work1 = payload->blob;
work1 = asn1_encode_sequence(work1, work1 + sizeof(payload->blob),
scratch, work - scratch);
- if (WARN(IS_ERR(work1), "BUG: ASN.1 encoder failed"))
+ if (WARN(IS_ERR(work1), "BUG: ASN.1 encoder failed")) {
+ kfree(scratch);
return PTR_ERR(work1);
+ }

return work1 - payload->blob;
}
--
2.25.1
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