[tip:perf/urgent] perf tools: Fix mmap2 event allocation in synthesize code

[tip-bot for Wang Nan]

Commit-ID:  b0fb978e97f58ca930f7cafc4ddc264218710765
Gitweb:     http://git.kernel.org/tip/b0fb978e97f58ca930f7cafc4ddc264218710765
Author:     Wang Nan <wangnan0@xxxxxxxxxx>
AuthorDate: Tue, 12 Jan 2016 10:12:04 +0000
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 12 Jan 2016 11:24:43 -0300

perf tools: Fix mmap2 event allocation in synthesize code

perf_event__synthesize_mmap_events() issues mmap2 events, but the memory
of that event is allocated using:

 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);

If path of mmap source file is long (near PATH_MAX), random crash would
happen. Should use sizeof(mmap_event->mmap2).

Fix two memory allocations.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
Link: http://lkml.kernel.org/r/1452593524-138970-1-git-send-email-wangnan0@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/event.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index cd61bb1..85155e9 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -503,7 +503,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
 	if (comm_event == NULL)
 		goto out;
 
-	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
+	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 	if (mmap_event == NULL)
 		goto out_free_comm;
 
@@ -577,7 +577,7 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
 	if (comm_event == NULL)
 		goto out;
 
-	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
+	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 	if (mmap_event == NULL)
 		goto out_free_comm;