From 405f87557da35a03ba4663eca971ffac58b0a818 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Thu, 12 Mar 2015 16:32:46 +0900 Subject: [PATCH] perf kmem: Fix segfault when invalid sort key is given When it tries to free 'str', it was already updated by strsep() - so it needs to save the original pointer. # perf kmem stat -s xxx,hit Error: Unknown --sort key: 'xxx' *** Error in `perf': free(): invalid pointer: 0x0000000000e9e7b6 *** ======= Backtrace: ========= /usr/lib/libc.so.6(+0x7198e)[0x7fc7e6e0d98e] /usr/lib/libc.so.6(+0x76dee)[0x7fc7e6e12dee] /usr/lib/libc.so.6(+0x775cb)[0x7fc7e6e135cb] ./perf[0x44a1b5] ./perf[0x490b20] ./perf(parse_options_step+0x173)[0x491773] ./perf(parse_options_subcommand+0xa7)[0x491fb7] ./perf(cmd_kmem+0x2bc)[0x44ae4c] ./perf[0x47aa13] ./perf(main+0x60a)[0x427a9a] /usr/lib/libc.so.6(__libc_start_main+0xf0)[0x7fc7e6dbc800] ./perf(_start+0x29)[0x427bb9] Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Cc: Joonsoo Kim Cc: Minchan Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1426145571-3065-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-kmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c index 62f165a9fa40..1e69ea57a1cc 100644 --- a/tools/perf/builtin-kmem.c +++ b/tools/perf/builtin-kmem.c @@ -559,6 +559,7 @@ static int setup_sorting(struct list_head *sort_list, const char *arg) { char *tok; char *str = strdup(arg); + char *pos = str; if (!str) { pr_err("%s: strdup failed\n", __func__); @@ -566,7 +567,7 @@ static int setup_sorting(struct list_head *sort_list, const char *arg) } while (true) { - tok = strsep(&str, ","); + tok = strsep(&pos, ","); if (!tok) break; if (sort_dimension__add(tok, sort_list) < 0) { -- 2.20.1