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-rw-r--r--security/apparmor/match.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/security/apparmor/match.c b/security/apparmor/match.c
index 1ff823031c73..727eb4200d5c 100644
--- a/security/apparmor/match.c
+++ b/security/apparmor/match.c
@@ -23,6 +23,8 @@
#include "include/apparmor.h"
#include "include/match.h"
+#define base_idx(X) ((X) & 0xffffff)
+
/**
* unpack_table - unpack a dfa table (one of accept, default, base, next check)
* @blob: data to unpack (NOT NULL)
@@ -137,7 +139,7 @@ static int verify_dfa(struct aa_dfa *dfa, int flags)
for (i = 0; i < state_count; i++) {
if (DEFAULT_TABLE(dfa)[i] >= state_count)
goto out;
- if (BASE_TABLE(dfa)[i] + 255 >= trans_count) {
+ if (base_idx(BASE_TABLE(dfa)[i]) + 255 >= trans_count) {
printk(KERN_ERR "AppArmor DFA next/check upper "
"bounds error\n");
goto out;
@@ -313,7 +315,7 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start,
u8 *equiv = EQUIV_TABLE(dfa);
/* default is direct to next state */
for (; len; len--) {
- pos = base[state] + equiv[(u8) *str++];
+ pos = base_idx(base[state]) + equiv[(u8) *str++];
if (check[pos] == state)
state = next[pos];
else
@@ -322,7 +324,7 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start,
} else {
/* default is direct to next state */
for (; len; len--) {
- pos = base[state] + (u8) *str++;
+ pos = base_idx(base[state]) + (u8) *str++;
if (check[pos] == state)
state = next[pos];
else
@@ -363,7 +365,7 @@ unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start,
u8 *equiv = EQUIV_TABLE(dfa);
/* default is direct to next state */
while (*str) {
- pos = base[state] + equiv[(u8) *str++];
+ pos = base_idx(base[state]) + equiv[(u8) *str++];
if (check[pos] == state)
state = next[pos];
else
@@ -372,7 +374,7 @@ unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start,
} else {
/* default is direct to next state */
while (*str) {
- pos = base[state] + (u8) *str++;
+ pos = base_idx(base[state]) + (u8) *str++;
if (check[pos] == state)
state = next[pos];
else
@@ -408,14 +410,14 @@ unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state,
u8 *equiv = EQUIV_TABLE(dfa);
/* default is direct to next state */
- pos = base[state] + equiv[(u8) c];
+ pos = base_idx(base[state]) + equiv[(u8) c];
if (check[pos] == state)
state = next[pos];
else
state = def[state];
} else {
/* default is direct to next state */
- pos = base[state] + (u8) c;
+ pos = base_idx(base[state]) + (u8) c;
if (check[pos] == state)
state = next[pos];
else