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perf probe: Check for dup and fdopen failures 

dup and fdopen can potentially fail, so add some extra
error handling checks rather than assuming they always work.

Signed-off-by: Colin King <colin.king@canonical.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1471038296-12956-1-git-send-email-colin.king@canonical.com
[ Free resources when those functions (now being verified) fail ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Colin Ian King 2016-08-12 22:44:56 +01:00 committed by Arnaldo Carvalho de Melo
parent 50de1a0c54
commit 0325862dc3
1 changed files with 20 additions and 4 deletions
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24
tools/perf/util/probe-file.c
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@ -133,7 +133,7 @@ int probe_file__open_both(int *kfd, int *ufd, int flag)
/* Get raw string list of current kprobe_events or uprobe_events */
struct strlist *probe_file__get_rawlist(int fd)
{
int ret, idx;
int ret, idx, fddup;
FILE *fp;
char buf[MAX_CMDLEN];
char *p;
@ -144,7 +144,14 @@ struct strlist *probe_file__get_rawlist(int fd)
sl = strlist__new(NULL, NULL);
fp = fdopen(dup(fd), "r");
fddup = dup(fd);
if (fddup < 0)
goto out_free_sl;
fp = fdopen(fddup, "r");
if (!fp)
goto out_close_fddup;
while (!feof(fp)) {
p = fgets(buf, MAX_CMDLEN, fp);
if (!p)
@ -163,6 +170,12 @@ struct strlist *probe_file__get_rawlist(int fd)
fclose(fp);
return sl;
out_close_fddup:
close(fddup);
out_free_sl:
strlist__delete(sl);
return NULL;
}
static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
@ -447,10 +460,13 @@ static int probe_cache__load(struct probe_cache *pcache)
{
struct probe_cache_entry *entry = NULL;
char buf[MAX_CMDLEN], *p;
int ret = 0;
int ret = 0, fddup;
FILE *fp;
fp = fdopen(dup(pcache->fd), "r");
fddup = dup(pcache->fd);
if (fddup < 0)
return -errno;
fp = fdopen(fddup, "r");
if (!fp)
return -EINVAL;