diff options
| -rw-r--r-- | security/apparmor/match.c | 16 |
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 |