From 0f8983cf97d3327531b7843c831517cac3a1b9ed Mon Sep 17 00:00:00 2001 From: Casey Schaufler Date: Fri, 1 Jun 2018 10:45:12 -0700 Subject: Smack: Fix memory leak in smack_inode_getsecctx Fix memory leak in smack_inode_getsecctx The implementation of smack_inode_getsecctx() made incorrect assumptions about how Smack presents a security context. Smack does not need to allocate memory to support security contexts, so "releasing" a Smack context is a no-op. The code made an unnecessary copy and returned that as a context, which was never freed. The revised implementation returns the context correctly. Signed-off-by: Casey Schaufler Reported-by: CHANDAN VN Tested-by: CHANDAN VN --- security/smack/smack_lsm.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'security') diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 0b414836bebd..5e3beae334a8 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1545,9 +1545,9 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer, */ static void smack_inode_getsecid(struct inode *inode, u32 *secid) { - struct inode_smack *isp = inode->i_security; + struct smack_known *skp = smk_of_inode(inode); - *secid = isp->smk_inode->smk_secid; + *secid = skp->smk_secid; } /* @@ -4538,12 +4538,10 @@ static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) { - int len = 0; - len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); + struct smack_known *skp = smk_of_inode(inode); - if (len < 0) - return len; - *ctxlen = len; + *ctx = skp->smk_known; + *ctxlen = strlen(skp->smk_known); return 0; } -- cgit v1.2.3-58-ga151