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Haotian Zhang
6727b7618f
ftrace_direct_multi_init() assigns kthread_run()'s return value to
simple_tsk without an IS_ERR() check. When kthread_run() fails it
returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads
with simple_tsk holding an error pointer. On unload,
ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(),
leading to a null-pointer-dereference.
Check the return value of kthread_run() with IS_ERR(); on failure,
unregister the ftrace direct call and propagate the error code.
Link: https://patch.msgid.link/[email protected]
Fixes: e1067a07cf ("ftrace/samples: Add module to test multi direct modify interface")
Suggested-by: Steven Rostedt <[email protected]>
Signed-off-by: Haotian Zhang <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>