Commit 09a3dac7 authored by Martin KaFai Lau's avatar Martin KaFai Lau Committed by Alexei Starovoitov

bpf: Fix NULL dereference in bpf_task_storage

In bpf_pid_task_storage_update_elem(), it missed to
test the !task_storage_ptr(task) which then could trigger a NULL
pointer exception in bpf_local_storage_update().

Fixes: 4cf1bc1f ("bpf: Implement task local storage")
Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Tested-by: default avatarRoman Gushchin <guro@fb.com>
Acked-by: default avatarKP Singh <kpsingh@google.com>
Link: https://lore.kernel.org/bpf/20201112001919.2028357-1-kafai@fb.com
parent 8378788c
......@@ -150,7 +150,7 @@ static int bpf_pid_task_storage_update_elem(struct bpf_map *map, void *key,
*/
WARN_ON_ONCE(!rcu_read_lock_held());
task = pid_task(pid, PIDTYPE_PID);
if (!task) {
if (!task || !task_storage_ptr(task)) {
err = -ENOENT;
goto out;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment