From: Philippe Proulx <eeppeliteloop@gmail.com>
Date: Wed, 26 Aug 2015 05:05:13 +0000 (-0400)
Subject: Fix: lay out names in exclusion structure correctly
X-Git-Tag: v2.8.0-rc1~234
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=caafa356e8d01136385864c5e74b85387fa2bf71

Fix: lay out names in exclusion structure correctly

This:

    char names[0][LTTNG_SYMBOL_NAME_LEN];

means that accessing

    ->names[0][i]

will return the i-th character of the first name.
So doing:

    lttng enable-event -u -a --exclude hello,a,b,c,d
    lttng save

would result in a saved session XML file containing
this:

    <exclusion>hello</exclusion>
    <exclusion>ello</exclusion>
    <exclusion>llo</exclusion>
    <exclusion>lo</exclusion>
    <exclusion>o</exclusion>

This is great art, but not what is expected.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/save.c b/src/bin/lttng-sessiond/save.c
index cc7bfe1e0..065fb3f02 100644
--- a/src/bin/lttng-sessiond/save.c
+++ b/src/bin/lttng-sessiond/save.c
@@ -674,7 +674,7 @@ int save_ust_event(struct config_writer *writer,
 		for (i = 0; i < event->exclusion->count; i++) {
 			ret = config_writer_write_element_string(writer,
 				config_element_exclusion,
-				&event->exclusion->names[0][i]);
+				&event->exclusion->names[i][0]);
 			if (ret) {
 				ret = LTTNG_ERR_SAVE_IO_FAIL;
 				goto end;
diff --git a/src/common/sessiond-comm/sessiond-comm.h b/src/common/sessiond-comm/sessiond-comm.h
index 67d1bcfaf..1e0ee5d45 100644
--- a/src/common/sessiond-comm/sessiond-comm.h
+++ b/src/common/sessiond-comm/sessiond-comm.h
@@ -333,7 +333,7 @@ struct lttng_filter_bytecode {
 struct lttng_event_exclusion {
 	uint32_t count;
 	char padding[LTTNG_EVENT_EXCLUSION_PADDING];
-	char names[LTTNG_SYMBOL_NAME_LEN][0];
+	char names[0][LTTNG_SYMBOL_NAME_LEN];
 } LTTNG_PACKED;
 
 /*