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| author | Roberto Sassu <roberto.sassu@huawei.com> | 2020-06-05 08:50:28 +0200 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2020-06-05 06:04:11 -0400 |
| commit | 42413b49804b250ced70dac8815388af2d4ad872 (patch) | |
| tree | 3601d25bbbea1399bc3207955e9340bd49fd09fd /security | |
| parent | 6cc7c266e5b47d3cd2b5bb7fd3aac4e6bb2dd1d2 (diff) | |
| download | linux-42413b49804b250ced70dac8815388af2d4ad872.tar.gz linux-42413b49804b250ced70dac8815388af2d4ad872.tar.bz2 linux-42413b49804b250ced70dac8815388af2d4ad872.zip | |
ima: Directly free *entry in ima_alloc_init_template() if digests is NULL
To support multiple template digests, the static array entry->digest has
been replaced with a dynamically allocated array in commit aa724fe18a8a
("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: aa724fe18a8a ("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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_api.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index 78e0b0a7723e..bf22de8b7ce0 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -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; |