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-rw-r--r--ipc/shm.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 7a51443a51d6..1bc68f115842 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -975,6 +975,13 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
goto out_unlock1;
ipc_lock_object(&shp->shm_perm);
+
+ /* check if shm_destroy() is tearing down shp */
+ if (!ipc_valid_object(&shp->shm_perm)) {
+ err = -EIDRM;
+ goto out_unlock0;
+ }
+
if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
kuid_t euid = current_euid();
if (!uid_eq(euid, shp->shm_perm.uid) &&
@@ -989,13 +996,6 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
}
shm_file = shp->shm_file;
-
- /* check if shm_destroy() is tearing down shp */
- if (shm_file == NULL) {
- err = -EIDRM;
- goto out_unlock0;
- }
-
if (is_file_hugepages(shm_file))
goto out_unlock0;
@@ -1116,7 +1116,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
ipc_lock_object(&shp->shm_perm);
/* check if shm_destroy() is tearing down shp */
- if (shp->shm_file == NULL) {
+ if (!ipc_valid_object(&shp->shm_perm)) {
ipc_unlock_object(&shp->shm_perm);
err = -EIDRM;
goto out_unlock;

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