diff options
| -rw-r--r-- | security/apparmor/include/match.h | 3 | ||||
| -rw-r--r-- | security/apparmor/match.c | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h index 4bb0405c9190..0539abda328d 100644 --- a/security/apparmor/include/match.h +++ b/security/apparmor/include/match.h @@ -135,7 +135,8 @@ aa_state_t aa_dfa_matchn_until(struct aa_dfa *dfa, aa_state_t start, void aa_dfa_free_kref(struct kref *kref); -#define WB_HISTORY_SIZE 24 +/* This needs to be a power of 2 */ +#define WB_HISTORY_SIZE 32 struct match_workbuf { unsigned int count; unsigned int pos; diff --git a/security/apparmor/match.c b/security/apparmor/match.c index 517d77d3c34c..0f791a58d933 100644 --- a/security/apparmor/match.c +++ b/security/apparmor/match.c @@ -626,6 +626,7 @@ aa_state_t aa_dfa_matchn_until(struct aa_dfa *dfa, aa_state_t start, #define inc_wb_pos(wb) \ do { \ + BUILD_BUG_ON_NOT_POWER_OF_2(WB_HISTORY_SIZE); \ wb->pos = (wb->pos + 1) & (WB_HISTORY_SIZE - 1); \ wb->len = (wb->len + 1) & (WB_HISTORY_SIZE - 1); \ } while (0) |