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ima: Directly free *entry in ima_alloc_init_template() if digests is NULL

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To support multiple template digests, the static array entry->digest has
been replaced with a dynamically allocated array in commit aa724fe18a
("ima: Switch to dynamically allocated buffer for template digests"). The
array is allocated in ima_alloc_init_template() and if the returned pointer
is NULL, ima_free_template_entry() is called.

However, (*entry)->template_desc is not yet initialized while it is used by
ima_free_template_entry(). This patch fixes the issue by directly freeing
*entry without calling ima_free_template_entry().

Fixes: aa724fe18a ("ima: Switch to dynamically allocated buffer for template digests")
Reported-by: syzbot+223310b454ba6b75974e@syzkaller.appspotmail.com
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Roberto Sassu 2020-06-05 08:50:28 +02:00 committed by Mimi Zohar
parent 6cc7c266e5
commit 42413b4980
1 changed files with 3 additions and 2 deletions
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5
security/integrity/ima/ima_api.c
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@ -55,8 +55,9 @@ int ima_alloc_init_template(struct ima_event_data *event_data,
digests = kcalloc(NR_BANKS(ima_tpm_chip) + ima_extra_slots,
sizeof(*digests), GFP_NOFS);
if (!digests) {
result = -ENOMEM;
goto out;
kfree(*entry);
*entry = NULL;
return -ENOMEM;
}
(*entry)->digests = digests;