From 421fd0845eaeecce6b3806f7f0c0d67d1f9ad108 Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Fri, 6 Nov 2015 09:50:15 +0000 Subject: [PATCH] perf probe: Verify parameters in two functions On kernel with only one out of CONFIG_KPROBE_EVENTS and CONFIG_UPROBE_EVENTS enabled, 'perf probe -d' causes a segfault because perf_del_probe_events() calls probe_file__get_events() with a negative fd. This patch fixes it by adding parameter validation at the entry of probe_file__get_events() and probe_file__get_rawlist(). Since they are both non-static public functions (in .h file), parameter verifying is required. v1 -> v2: Verify fd at the head of probe_file__get_rawlist() instead of checking at call site (suggested by Masami and Arnaldo at [1,2]). [1] http://lkml.kernel.org/r/50399556C9727B4D88A595C8584AAB37526048E3@GSjpTKYDCembx32.service.hitachi.net [2] http://lkml.kernel.org/r/20151105155830.GV13236@kernel.org Signed-off-by: Wang Nan Acked-by: Masami Hiramatsu Cc: Jiri Olsa Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1446803415-83382-1-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index 89dbeb92c68e..e3b3b92e4458 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -138,6 +138,9 @@ struct strlist *probe_file__get_rawlist(int fd) char *p; struct strlist *sl; + if (fd < 0) + return NULL; + sl = strlist__new(NULL, NULL); fp = fdopen(dup(fd), "r"); @@ -271,6 +274,9 @@ int probe_file__get_events(int fd, struct strfilter *filter, const char *p; int ret = -ENOENT; + if (!plist) + return -EINVAL; + namelist = __probe_file__get_namelist(fd, true); if (!namelist) return -ENOENT; -- 2.20.1