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tracing: Fix some alloc_event_probe() error handling bugs

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There are two bugs in this code.  First, if the kzalloc() fails it leads
to a NULL dereference of "ep" on the next line.  Second, if the
alloc_event_probe() function returns an error then it leads to an
error pointer dereference in the caller.

Link: https://lkml.kernel.org/r/20210824115150.GI31143@kili

Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Dan Carpenter 2021-08-24 14:51:50 +03:00 committed by Steven Rostedt (VMware)
parent 54357f0c91
commit 5615e088b4
1 changed files with 3 additions and 2 deletions
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5
kernel/trace/trace_eprobe.c
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@ -151,7 +151,7 @@ static struct trace_eprobe *alloc_event_probe(const char *group,
ep = kzalloc(struct_size(ep, tp.args, nargs), GFP_KERNEL);
if (!ep) {
trace_event_put_ref(ep->event);
trace_event_put_ref(event);
goto error;
}
ep->event = event;
@ -851,7 +851,8 @@ static int __trace_eprobe_create(int argc, const char *argv[])
ret = PTR_ERR(ep);
/* This must return -ENOMEM, else there is a bug */
WARN_ON_ONCE(ret != -ENOMEM);
goto error; /* We know ep is not allocated */
ep = NULL;
goto error;
}
argc -= 2; argv += 2;