From: "Steven Rostedt (VMware)" <rost...@goodmis.org>

[ Upstream commit 38d70b7ca1769f26c0b79f3c08ff2cc949712b59 ]

When processing %pX in pretty_print(), simplify the logic slightly by
incrementing the ptr to the format string if isalnum(ptr[1]) is true.
This follows the logic a bit more closely to what is in the kernel.

Also, this fixes a small bug where %pF was not giving the offset of the
function.

Signed-off-by: Steven Rostedt <rost...@goodmis.org>
Acked-by: Namhyung Kim <namhy...@kernel.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Link: http://lkml.kernel.org/r/20180112004822.260262...@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 tools/lib/traceevent/event-parse.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c 
b/tools/lib/traceevent/event-parse.c
index 68276f35e323..6e4a10fe9dd0 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -4905,21 +4905,22 @@ static void pretty_print(struct trace_seq *s, void 
*data, int size, struct event
                                else
                                        ls = 2;
 
-                               if (*(ptr+1) == 'F' || *(ptr+1) == 'f' ||
-                                   *(ptr+1) == 'S' || *(ptr+1) == 's') {
+                               if (isalnum(ptr[1]))
                                        ptr++;
+
+                               if (*ptr == 'F' || *ptr == 'f' ||
+                                   *ptr == 'S' || *ptr == 's') {
                                        show_func = *ptr;
-                               } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
-                                       print_mac_arg(s, *(ptr+1), data, size, 
event, arg);
-                                       ptr++;
+                               } else if (*ptr == 'M' || *ptr == 'm') {
+                                       print_mac_arg(s, *ptr, data, size, 
event, arg);
                                        arg = arg->next;
                                        break;
-                               } else if (*(ptr+1) == 'I' || *(ptr+1) == 'i') {
+                               } else if (*ptr == 'I' || *ptr == 'i') {
                                        int n;
 
-                                       n = print_ip_arg(s, ptr+1, data, size, 
event, arg);
+                                       n = print_ip_arg(s, ptr, data, size, 
event, arg);
                                        if (n > 0) {
-                                               ptr += n;
+                                               ptr += n - 1;
                                                arg = arg->next;
                                                break;
                                        }
-- 
2.15.1

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