From: David Disseldorp ddiss@suse.de
[ Upstream commit 03e1d60e177eedbd302b77af4ea5e21b5a7ade31 ]
The watch_queue_set_size() allocation error paths return the ret value set via the prior pipe_resize_ring() call, which will always be zero.
As a result, IOC_WATCH_QUEUE_SET_SIZE callers such as "keyctl watch" fail to detect kernel wqueue->notes allocation failures and proceed to KEYCTL_WATCH_KEY, with any notifications subsequently lost.
Fixes: c73be61cede58 ("pipe: Add general notification queue support") Signed-off-by: David Disseldorp ddiss@suse.de Signed-off-by: Christian Brauner (Microsoft) brauner@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/watch_queue.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c index 1059ef6c3711a..54cbaa9711398 100644 --- a/kernel/watch_queue.c +++ b/kernel/watch_queue.c @@ -274,6 +274,7 @@ long watch_queue_set_size(struct pipe_inode_info *pipe, unsigned int nr_notes) if (ret < 0) goto error;
+ ret = -ENOMEM; pages = kcalloc(sizeof(struct page *), nr_pages, GFP_KERNEL); if (!pages) goto error;