Tracing fixes for 5.13:

- Fix the length check in the temp buffer filter
 
  - Fix build failure in bootconfig tools for "fallthrough" macro
 
  - Fix error return of bootconfig apply_xbc() routine
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Merge tag 'trace-v5.13-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Fix the length check in the temp buffer filter

 - Fix build failure in bootconfig tools for "fallthrough" macro

 - Fix error return of bootconfig apply_xbc() routine

* tag 'trace-v5.13-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Correct the length check which causes memory corruption
  ftrace: Do not blindly read the ip address in ftrace_bug()
  tools/bootconfig: Fix a build error accroding to undefined fallthrough
  tools/bootconfig: Fix error return code in apply_xbc()

kernel/trace/ftrace.c

@@ -1967,12 +1967,18 @@ static int ftrace_hash_ipmodify_update(struct ftrace_ops *ops,
 
 static void print_ip_ins(const char *fmt, const unsigned char *p)
 {
+	char ins[MCOUNT_INSN_SIZE];
 	int i;
 
+	if (copy_from_kernel_nofault(ins, p, MCOUNT_INSN_SIZE)) {
+		printk(KERN_CONT "%s[FAULT] %px\n", fmt, p);
+		return;
+	}
+
 	printk(KERN_CONT "%s", fmt);
 
 	for (i = 0; i < MCOUNT_INSN_SIZE; i++)
-		printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
+		printk(KERN_CONT "%s%02x", i ? ":" : "", ins[i]);
 }
 
 enum ftrace_bug_type ftrace_bug_type;

kernel/trace/trace.c

@@ -2736,7 +2736,7 @@ trace_event_buffer_lock_reserve(struct trace_buffer **current_rb,
 	    (entry = this_cpu_read(trace_buffered_event))) {
 		/* Try to use the per cpu buffer first */
 		val = this_cpu_inc_return(trace_buffered_event_cnt);
-		if ((len < (PAGE_SIZE - sizeof(*entry))) && val == 1) {
+		if ((len < (PAGE_SIZE - sizeof(*entry) - sizeof(entry->array[0]))) && val == 1) {
 			trace_event_setup(entry, type, trace_ctx);
 			entry->array[0] = len;
 			return entry;

tools/bootconfig/include/linux/bootconfig.h

@@ -4,4 +4,8 @@
 
 #include "../../../../include/linux/bootconfig.h"
 
+#ifndef fallthrough
+# define fallthrough
+#endif
+
 #endif

tools/bootconfig/main.c

@@ -399,6 +399,7 @@ static int apply_xbc(const char *path, const char *xbc_path)
 	}
 	/* TODO: Ensure the @path is initramfs/initrd image */
 	if (fstat(fd, &stat) < 0) {
+		ret = -errno;
 		pr_err("Failed to get the size of %s\n", path);
 		goto out;
 	}