[PATCH 07/46] selinux: Delete unnecessary variable assignments in policydb_index()

SF Markus Elfring
2017-01-15T15:05:04Z

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 14 Jan 2017 13:40:25 +0100

The local variable "rc" was reset with an error code up to five times
before a memory allocation failure was detected.

Add a jump target so that this assignment will only be performed after
a concrete software failure.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
security/selinux/ss/policydb.c | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 21869b622c0c..4d4ba1ad910d 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -539,34 +539,30 @@ static int policydb_index(struct policydb *p)
symtab_hash_eval(p->symtab);
#endif

- rc = -ENOMEM;
p->class_val_to_struct = kcalloc(p->p_classes.nprim,
sizeof(*p->class_val_to_struct),
GFP_KERNEL);
if (!p->class_val_to_struct)
- goto out;
+ goto failure_indication;

- rc = -ENOMEM;
p->role_val_to_struct = kcalloc(p->p_roles.nprim,
sizeof(*p->role_val_to_struct),
GFP_KERNEL);
if (!p->role_val_to_struct)
- goto out;
+ goto failure_indication;

- rc = -ENOMEM;
p->user_val_to_struct = kcalloc(p->p_users.nprim,
sizeof(*p->user_val_to_struct),
GFP_KERNEL);
if (!p->user_val_to_struct)
- goto out;
+ goto failure_indication;

/* Yes, I want the sizeof the pointer, not the structure */
- rc = -ENOMEM;
p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
p->p_types.nprim,
GFP_KERNEL | __GFP_ZERO);
if (!p->type_val_to_struct_array)
- goto out;
+ goto failure_indication;

rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
@@ -578,12 +574,11 @@ static int policydb_index(struct policydb *p)
goto out;

for (i = 0; i < SYM_NUM; i++) {
- rc = -ENOMEM;
p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
p->symtab[i].nprim,
GFP_KERNEL | __GFP_ZERO);
if (!p->sym_val_to_name[i])
- goto out;
+ goto failure_indication;

rc = flex_array_prealloc(p->sym_val_to_name[i],
0, p->symtab[i].nprim,
@@ -598,6 +593,9 @@ static int policydb_index(struct policydb *p)
rc = 0;
out:
return rc;
+failure_indication:
+ rc = -ENOMEM;
+ goto out;
}

/*
--
2.11.0