[PATCH 5.11 207/775] evm: Fix memleak in init_desc
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-03-02 00:24:03
Also in:
lkml
Subsystem:
extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
From: Dinghao Liu <redacted>
[ Upstream commit ccf11dbaa07b328fa469415c362d33459c140a37 ]
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 <redacted>
[zohar@linux.ibm.com: formatted/reworded patch description]
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
security/integrity/evm/evm_crypto.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index 168c3b78ac47b..a6dd47eb086da 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); }
--
2.27.0