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2eb5dd4180
When using 'perf record's option '-I' or '--user-regs=' along with
argument '?' to list available register names, memory of variable 'os'
allocated by strdup() needs to be released before __parse_regs()
returns, otherwise memory leak will occur.
Fixes: bcc84ec65a ("perf record: Add ability to name registers to record")
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Li Bin <huawei.libin@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20200703093344.189450-1-zhengzengkai@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdio.h>
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#include "util/debug.h"
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#include <subcmd/parse-options.h>
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#include "util/perf_regs.h"
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#include "util/parse-regs-options.h"
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static int
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__parse_regs(const struct option *opt, const char *str, int unset, bool intr)
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{
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uint64_t *mode = (uint64_t *)opt->value;
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const struct sample_reg *r = NULL;
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char *s, *os = NULL, *p;
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int ret = -1;
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uint64_t mask;
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if (unset)
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return 0;
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/*
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* cannot set it twice
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*/
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if (*mode)
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return -1;
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if (intr)
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mask = arch__intr_reg_mask();
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else
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mask = arch__user_reg_mask();
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/* str may be NULL in case no arg is passed to -I */
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if (str) {
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/* because str is read-only */
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s = os = strdup(str);
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if (!s)
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return -1;
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for (;;) {
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p = strchr(s, ',');
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if (p)
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*p = '\0';
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if (!strcmp(s, "?")) {
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fprintf(stderr, "available registers: ");
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#ifdef HAVE_PERF_REGS_SUPPORT
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for (r = sample_reg_masks; r->name; r++) {
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if (r->mask & mask)
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fprintf(stderr, "%s ", r->name);
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}
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#endif
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fputc('\n', stderr);
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/* just printing available regs */
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goto error;
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}
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#ifdef HAVE_PERF_REGS_SUPPORT
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for (r = sample_reg_masks; r->name; r++) {
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if ((r->mask & mask) && !strcasecmp(s, r->name))
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break;
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}
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#endif
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if (!r || !r->name) {
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ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
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s, intr ? "-I" : "--user-regs=");
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goto error;
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}
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*mode |= r->mask;
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if (!p)
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break;
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s = p + 1;
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}
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}
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ret = 0;
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/* default to all possible regs */
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if (*mode == 0)
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*mode = mask;
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error:
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free(os);
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return ret;
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}
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int
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parse_user_regs(const struct option *opt, const char *str, int unset)
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{
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return __parse_regs(opt, str, unset, false);
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}
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int
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parse_intr_regs(const struct option *opt, const char *str, int unset)
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{
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return __parse_regs(opt, str, unset, true);
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}
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