From: Divya Indi Date: Wed, 14 Aug 2019 17:55:25 +0000 (-0700) Subject: tracing: Adding NULL checks for trace_array descriptor pointer X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=953ae45a0c25e09428d4a03d7654f97ab8a36647;p=linux.git 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 Signed-off-by: Steven Rostedt (VMware) --- diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fa4f742fc449a..79fe4d6ecbd81 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); diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index fba87d10f0c1a..2a3ac23654452 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -793,6 +793,8 @@ int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) char *event = NULL, *sub = NULL, *match; int ret; + if (!tr) + return -ENOENT; /* * The buf format can be : * *: means any event by that name.