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| author | Divya Indi <divya.indi@oracle.com> | 2019-08-14 10:55:25 -0700 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-11-13 09:37:29 -0500 |
| commit | 953ae45a0c25e09428d4a03d7654f97ab8a36647 (patch) | |
| tree | 9a80b253fdd9a4a5bd5c03934a98d98672988bf7 /kernel/trace/trace.c | |
| parent | e585e6469d6f476b82aa148dc44aaf7ae269a4e2 (diff) | |
| download | lwn-953ae45a0c25e09428d4a03d7654f97ab8a36647.tar.gz lwn-953ae45a0c25e09428d4a03d7654f97ab8a36647.zip | |
tracing: Adding NULL checks for trace_array descriptor pointer
As part of commit f45d1225adb0 ("tracing: Kernel access to Ftrace
instances") we exported certain functions. Here, we are adding some additional
NULL checks to ensure safe usage by users of these APIs.
Link: http://lkml.kernel.org/r/1565805327-579-4-git-send-email-divya.indi@oracle.com
Signed-off-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fa4f742fc449..79fe4d6ecbd8 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3297,6 +3297,9 @@ int trace_array_printk(struct trace_array *tr, if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) return 0; + if (!tr) + return -ENOENT; + va_start(ap, fmt); ret = trace_array_vprintk(tr, ip, fmt, ap); va_end(ap); |