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Diffstat (limited to 'fs/userfaultfd.c')
-rw-r--r--fs/userfaultfd.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 5f11678907d5..af88ef6fffff 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -577,7 +577,6 @@ static ssize_t userfaultfd_read(struct file *file, char __user *buf,
if (ctx->state == UFFD_STATE_WAIT_API)
return -EINVAL;
- BUG_ON(ctx->state != UFFD_STATE_RUNNING);
for (;;) {
if (count < sizeof(msg))
@@ -1115,6 +1114,9 @@ static long userfaultfd_ioctl(struct file *file, unsigned cmd,
int ret = -EINVAL;
struct userfaultfd_ctx *ctx = file->private_data;
+ if (cmd != UFFDIO_API && ctx->state == UFFD_STATE_WAIT_API)
+ return -EINVAL;
+
switch(cmd) {
case UFFDIO_API:
ret = userfaultfd_api(ctx, arg);