lkml.org 
[lkml]   [2011]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/3] perf: __perf_evlist__mmap: Fix errno value on failed map.
Date
On failure, perf_evlist__mmap_per_{cpu,thread} will try to munmap()
every map that doesn't have a NULL base. This will fail with EINVAL if
one of them has base == MAP_FAILED, clobbering errno, so that
perf_evlist__map will return EINVAL on any failure regardless of the
root cause.

Fix this by resetting failed maps to a NULL base.

Signed-off-by: Nelson Elhage <nelhage@nelhage.com>
---
tools/perf/util/evlist.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index fbb4b4a..271c849 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -298,8 +298,10 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
evlist->mmap[idx].mask = mask;
evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
MAP_SHARED, fd, 0);
- if (evlist->mmap[idx].base == MAP_FAILED)
+ if (evlist->mmap[idx].base == MAP_FAILED) {
+ evlist->mmap[idx].base = NULL;
return -1;
+ }

perf_evlist__add_pollfd(evlist, fd);
return 0;
--
1.7.4.41.g50b8f


\
 
 \ /
  Last update: 2011-12-19 14:43    [W:0.078 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site