From: Himanshu Shukla Date: Thu, 10 Nov 2016 10:47:02 +0000 (+0530) Subject: SMACK: Fix the memory leak in smack_cred_prepare() hook X-Git-Tag: v4.10-rc1~116^2~35^2~3 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b437aba85b5c4689543409d8407c016749231aae;p=linux.git SMACK: Fix the memory leak in smack_cred_prepare() hook Memory leak in smack_cred_prepare()function. smack_cred_prepare() hook returns error if there is error in allocating memory in smk_copy_rules() or smk_copy_relabel() function. If smack_cred_prepare() function returns error then the calling function should call smack_cred_free() function for cleanup. In smack_cred_free() function first credential is extracted and then all rules are deleted. In smack_cred_prepare() function security field is assigned in the end when all function return success. But this function may return before and memory will not be freed. Signed-off-by: Himanshu Shukla Acked-by: Casey Schaufler --- diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 3a5684b47354..f7ee77c3db55 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2023,6 +2023,8 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old, if (new_tsp == NULL) return -ENOMEM; + new->security = new_tsp; + rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); if (rc != 0) return rc; @@ -2032,7 +2034,6 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old, if (rc != 0) return rc; - new->security = new_tsp; return 0; }