From f375bcf69f58fd0744c9dfd1b6b891a27301d67b Mon Sep 17 00:00:00 2001 From: Roberto Sassu Date: Wed, 2 Nov 2022 17:30:06 +0100 Subject: ima: Fix memory leak in __ima_inode_hash() commit 8c1d6a050a0f16e0a9d32eaf53b965c77279c6f8 upstream. Commit f3cc6b25dcc5 ("ima: always measure and audit files in policy") lets measurement or audit happen even if the file digest cannot be calculated. As a result, iint->ima_hash could have been allocated despite ima_collect_measurement() returning an error. Since ima_hash belongs to a temporary inode metadata structure, declared at the beginning of __ima_inode_hash(), just add a kfree() call if ima_collect_measurement() returns an error different from -ENOMEM (in that case, ima_hash should not have been allocated). Cc: stable@vger.kernel.org Fixes: 280fe8367b0d ("ima: Always return a file measurement in ima_file_hash()") Signed-off-by: Roberto Sassu Signed-off-by: Mimi Zohar Signed-off-by: Greg Kroah-Hartman --- security/integrity/ima/ima_main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 040b03ddc1c7..4a207a3ef7ef 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -542,8 +542,13 @@ static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf, rc = ima_collect_measurement(&tmp_iint, file, NULL, 0, ima_hash_algo, NULL); - if (rc < 0) + if (rc < 0) { + /* ima_hash could be allocated in case of failure. */ + if (rc != -ENOMEM) + kfree(tmp_iint.ima_hash); + return -EOPNOTSUPP; + } iint = &tmp_iint; mutex_lock(&iint->mutex); -- cgit v1.2.3