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-rw-r--r--ipc/shm.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index b204feb38274..b3b089315d3b 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -962,7 +962,6 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid,
int cmd, struct shmid64_ds *tbuf)
{
struct shmid_kernel *shp;
- int id = 0;
int err;
memset(tbuf, 0, sizeof(*tbuf));
@@ -974,7 +973,6 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid,
err = PTR_ERR(shp);
goto out_unlock;
}
- id = shp->shm_perm.id;
} else { /* IPC_STAT */
shp = shm_obtain_object_check(ns, shmid);
if (IS_ERR(shp)) {
@@ -1024,10 +1022,21 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid,
tbuf->shm_lpid = pid_vnr(shp->shm_lprid);
tbuf->shm_nattch = shp->shm_nattch;
- ipc_unlock_object(&shp->shm_perm);
- rcu_read_unlock();
- return id;
+ if (cmd == IPC_STAT) {
+ /*
+ * As defined in SUS:
+ * Return 0 on success
+ */
+ err = 0;
+ } else {
+ /*
+ * SHM_STAT and SHM_STAT_ANY (both Linux specific)
+ * Return the full id, including the sequence number
+ */
+ err = shp->shm_perm.id;
+ }
+ ipc_unlock_object(&shp->shm_perm);
out_unlock:
rcu_read_unlock();
return err;