diff options
Diffstat (limited to 'libc/misc/sysvipc/sem.c')
| -rw-r--r-- | libc/misc/sysvipc/sem.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libc/misc/sysvipc/sem.c b/libc/misc/sysvipc/sem.c index ec5c51490..66f86f53c 100644 --- a/libc/misc/sysvipc/sem.c +++ b/libc/misc/sysvipc/sem.c @@ -58,7 +58,10 @@ int semctl(int semid, int semnum, int cmd, ...) #ifdef __NR_semctl int __ret = __semctl(semid, semnum, cmd | __IPC_64, arg.__pad); #if (__WORDSIZE == 32) && defined(__UCLIBC_USE_TIME64__) - if (arg.__pad != NULL) { + // Only when cmd is IPC_STAT and IPC_SET, semun points to struct semid_ds. + // At this point, arg.__pad should not be NULL, but a check is added just + // to be safe. + if ((cmd & (IPC_STAT | IPC_SET)) && (arg.__pad != NULL)) { arg.buf->sem_otime = (__time_t)arg.buf->__sem_otime_internal_1 | (__time_t)(arg.buf->__sem_otime_internal_2) << 32; arg.buf->sem_ctime = (__time_t)arg.buf->__sem_ctime_internal_1 | (__time_t)(arg.buf->__sem_ctime_internal_2) << 32; } |