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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 <casey@schaufler-ca.com>
Reported-by: CHANDAN VN <chandan.vn@samsung.com>
Tested-by: CHANDAN VN <chandan.vn@samsung.com>
This commit is contained in:
Casey Schaufler 2018-06-01 10:45:12 -07:00
parent b3859ee18e
commit 0f8983cf97
1 changed files with 5 additions and 7 deletions
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12
security/smack/smack_lsm.c
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@ -1545,9 +1545,9 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer,
*/ */
static void smack_inode_getsecid(struct inode *inode, u32 *secid) 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) static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{ {
int len = 0; struct smack_known *skp = smk_of_inode(inode);
len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
if (len < 0) *ctx = skp->smk_known;
return len; *ctxlen = strlen(skp->smk_known);
*ctxlen = len;
return 0; return 0;
} }