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Subject[PATCH 3/5] perf probe: Fix some error exit paths
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

That could leave filedescriptors open and leak memory. Also stop using
xmalloc, use malloc and handle results just like other error cases in
the same routine that used it.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/probe-finder.c | 27 +++++++++++++++++----------
1 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 93583eb..0bfd46a 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -743,32 +743,34 @@ static int find_lazy_match_lines(struct list_head *head,
const char *fname, const char *pat)
{
char *fbuf, *p1, *p2;
- int fd, ret, line, nlines = 0;
+ int fd, line, nlines = -1;
struct stat st;

fd = open(fname, O_RDONLY);
if (fd < 0) {
pr_warning("Failed to open %s: %s\n", fname, strerror(-fd));
- return fd;
+ return -1;
}

- ret = fstat(fd, &st);
- if (ret < 0) {
+ nlines = fstat(fd, &st);
+ if (nlines < 0) {
pr_warning("Failed to get the size of %s: %s\n",
fname, strerror(errno));
- return ret;
+ goto out_close;
}
- fbuf = xmalloc(st.st_size + 2);
- ret = read(fd, fbuf, st.st_size);
- if (ret < 0) {
+ fbuf = malloc(st.st_size + 2);
+ if (fbuf == NULL)
+ goto out_close;
+ nlines = read(fd, fbuf, st.st_size);
+ if (nlines < 0) {
pr_warning("Failed to read %s: %s\n", fname, strerror(errno));
- return ret;
+ goto out_free_fbuf;
}
- close(fd);
fbuf[st.st_size] = '\n'; /* Dummy line */
fbuf[st.st_size + 1] = '\0';
p1 = fbuf;
line = 1;
+ nlines = 0;
while ((p2 = strchr(p1, '\n')) != NULL) {
*p2 = '\0';
if (strlazymatch(p1, pat)) {
@@ -778,7 +780,10 @@ static int find_lazy_match_lines(struct list_head *head,
line++;
p1 = p2 + 1;
}
+out_free_fbuf:
free(fbuf);
+out_close:
+ close(fd);
return nlines;
}

@@ -955,6 +960,8 @@ int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
if (!dbg) {
pr_warning("No dwarf info found in the vmlinux - "
"please rebuild with CONFIG_DEBUG_INFO=y.\n");
+ free(pf.tevs);
+ *tevs = NULL;
return -EBADF;
}

--
1.6.2.5
--
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