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-rw-r--r--linux-user/syscall.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index dac5518a07..8b76169ca5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -2598,8 +2598,9 @@ static abi_long do_socketcall(int num, abi_ulong vptr)
#define N_SHM_REGIONS 32
static struct shm_region {
- abi_ulong start;
- abi_ulong size;
+ abi_ulong start;
+ abi_ulong size;
+ bool in_use;
} shm_regions[N_SHM_REGIONS];
struct target_semid_ds
@@ -3291,7 +3292,8 @@ static inline abi_ulong do_shmat(int shmid, abi_ulong shmaddr, int shmflg)
((shmflg & SHM_RDONLY)? 0 : PAGE_WRITE));
for (i = 0; i < N_SHM_REGIONS; i++) {
- if (shm_regions[i].start == 0) {
+ if (!shm_regions[i].in_use) {
+ shm_regions[i].in_use = true;
shm_regions[i].start = raddr;
shm_regions[i].size = shm_info.shm_segsz;
break;
@@ -3308,8 +3310,8 @@ static inline abi_long do_shmdt(abi_ulong shmaddr)
int i;
for (i = 0; i < N_SHM_REGIONS; ++i) {
- if (shm_regions[i].start == shmaddr) {
- shm_regions[i].start = 0;
+ if (shm_regions[i].in_use && shm_regions[i].start == shmaddr) {
+ shm_regions[i].in_use = false;
page_set_flags(shmaddr, shmaddr + shm_regions[i].size, 0);
break;
}