[PATCH v5 07/10] perf tools: before yyabort-ing free components

From: Ian Rogers
Date: Wed Oct 30 2019 - 18:35:21 EST

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Yyabort doesn't destruct inputs and so this must be done manually before
using yyabort.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/util/parse-events.y | 252 ++++++++++++++++++++++++++-------
1 file changed, 197 insertions(+), 55 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 035edfa8d42e..376b19855470 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -152,6 +152,7 @@ start_events: groups
{
struct parse_events_state *parse_state = _parse_state;

+ /* frees $1 */
parse_events_update_lists($1, &parse_state->list);
}

@@ -161,6 +162,7 @@ groups ',' group
struct list_head *list = $1;
struct list_head *group = $3;

+ /* frees $3 */
parse_events_update_lists(group, list);
$$ = list;
}
@@ -170,6 +172,7 @@ groups ',' event
struct list_head *list = $1;
struct list_head *event = $3;

+ /* frees $3 */
parse_events_update_lists(event, list);
$$ = list;
}
@@ -182,8 +185,14 @@ group:
group_def ':' PE_MODIFIER_EVENT
{
struct list_head *list = $1;
+ int err;

- ABORT_ON(parse_events__modifier_group(list, $3));
+ err = parse_events__modifier_group(list, $3);
+ free($3);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -196,6 +205,7 @@ PE_NAME '{' events '}'

inc_group_count(list, _parse_state);
parse_events__set_leader($1, list, _parse_state);
+ free($1);
$$ = list;
}
|
@@ -214,6 +224,7 @@ events ',' event
struct list_head *event = $3;
struct list_head *list = $1;

+ /* frees $3 */
parse_events_update_lists(event, list);
$$ = list;
}
@@ -226,13 +237,19 @@ event_mod:
event_name PE_MODIFIER_EVENT
{
struct list_head *list = $1;
+ int err;

/*
* Apply modifier on all events added by single event definition
* (there could be more events added for multiple tracepoint
* definitions via '*?'.
*/
- ABORT_ON(parse_events__modifier_event(list, $2, false));
+ err = parse_events__modifier_event(list, $2, false);
+ free($2);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -241,8 +258,14 @@ event_name
event_name:
PE_EVENT_NAME event_def
{
- ABORT_ON(parse_events_name($2, $1));
+ int err;
+
+ err = parse_events_name($2, $1);
free($1);
+ if (err) {
+ free_list_evsel($2);
+ YYABORT;
+ }
$$ = $2;
}
|
@@ -262,23 +285,33 @@ PE_NAME opt_pmu_config
{
struct parse_events_state *parse_state = _parse_state;
struct parse_events_error *error = parse_state->error;
- struct list_head *list, *orig_terms, *terms;
+ struct list_head *list = NULL, *orig_terms = NULL, *terms= NULL;
+ char *pattern = NULL;
+
+#define CLEANUP_YYABORT \
+ do { \
+ parse_events_terms__delete($2); \
+ parse_events_terms__delete(orig_terms); \
+ free($1); \
+ free(pattern); \
+ YYABORT; \
+ } while(0)

if (parse_events_copy_term_list($2, &orig_terms))
- YYABORT;
+ CLEANUP_YYABORT;

if (error)
error->idx = @1.first_column;

list = alloc_list();
- ABORT_ON(!list);
+ if (!list)
+ CLEANUP_YYABORT;
if (parse_events_add_pmu(_parse_state, list, $1, $2, false, false)) {
struct perf_pmu *pmu = NULL;
int ok = 0;
- char *pattern;

if (asprintf(&pattern, "%s*", $1) < 0)
- YYABORT;
+ CLEANUP_YYABORT;

while ((pmu = perf_pmu__scan(pmu)) != NULL) {
char *name = pmu->name;
@@ -287,31 +320,32 @@ PE_NAME opt_pmu_config
strncmp($1, "uncore_", 7))
name += 7;
if (!fnmatch(pattern, name, 0)) {
- if (parse_events_copy_term_list(orig_terms, &terms)) {
- free(pattern);
- YYABORT;
- }
+ if (parse_events_copy_term_list(orig_terms, &terms))
+ CLEANUP_YYABORT;
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true, false))
ok++;
parse_events_terms__delete(terms);
}
}

- free(pattern);
-
if (!ok)
- YYABORT;
+ CLEANUP_YYABORT;
}
parse_events_terms__delete($2);
parse_events_terms__delete(orig_terms);
+ free($1);
$$ = list;
+#undef CLEANUP_YYABORT
}
|
PE_KERNEL_PMU_EVENT sep_dc
{
struct list_head *list;
+ int err;

- if (parse_events_multi_pmu_add(_parse_state, $1, &list) < 0)
+ err = parse_events_multi_pmu_add(_parse_state, $1, &list);
+ free($1);
+ if (err < 0)
YYABORT;
$$ = list;
}
@@ -322,6 +356,8 @@ PE_PMU_EVENT_PRE '-' PE_PMU_EVENT_SUF sep_dc
char pmu_name[128];

snprintf(&pmu_name, 128, "%s-%s", $1, $3);
+ free($1);
+ free($3);
if (parse_events_multi_pmu_add(_parse_state, pmu_name, &list) < 0)
YYABORT;
$$ = list;
@@ -338,11 +374,16 @@ value_sym '/' event_config '/'
struct list_head *list;
int type = $1 >> 16;
int config = $1 & 255;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_numeric(_parse_state, list, type, config, $3));
+ err = parse_events_add_numeric(_parse_state, list, type, config, $3);
parse_events_terms__delete($3);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -374,11 +415,19 @@ PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT '-' PE_NAME_CACHE_OP_RESULT opt_e
struct parse_events_state *parse_state = _parse_state;
struct parse_events_error *error = parse_state->error;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_cache(list, &parse_state->idx, $1, $3, $5, error, $6));
+ err = parse_events_add_cache(list, &parse_state->idx, $1, $3, $5, error, $6);
parse_events_terms__delete($6);
+ free($1);
+ free($3);
+ free($5);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -387,11 +436,18 @@ PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT opt_event_config
struct parse_events_state *parse_state = _parse_state;
struct parse_events_error *error = parse_state->error;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_cache(list, &parse_state->idx, $1, $3, NULL, error, $4));
+ err = parse_events_add_cache(list, &parse_state->idx, $1, $3, NULL, error, $4);
parse_events_terms__delete($4);
+ free($1);
+ free($3);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -400,11 +456,17 @@ PE_NAME_CACHE_TYPE opt_event_config
struct parse_events_state *parse_state = _parse_state;
struct parse_events_error *error = parse_state->error;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_cache(list, &parse_state->idx, $1, NULL, NULL, error, $2));
+ err = parse_events_add_cache(list, &parse_state->idx, $1, NULL, NULL, error, $2);
parse_events_terms__delete($2);
+ free($1);
+ if (err) {
+ free_list_evsel(list);
+ YYABORT;
+ }
$$ = list;
}

@@ -413,11 +475,17 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
{
struct parse_events_state *parse_state = _parse_state;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_breakpoint(list, &parse_state->idx,
- (void *) $2, $6, $4));
+ err = parse_events_add_breakpoint(list, &parse_state->idx,
+ (void *) $2, $6, $4);
+ free($6);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -428,8 +496,11 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE sep_dc

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_breakpoint(list, &parse_state->idx,
- (void *) $2, NULL, $4));
+ if (parse_events_add_breakpoint(list, &parse_state->idx,
+ (void *) $2, NULL, $4)) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -437,11 +508,17 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
{
struct parse_events_state *parse_state = _parse_state;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_breakpoint(list, &parse_state->idx,
- (void *) $2, $4, 0));
+ err = parse_events_add_breakpoint(list, &parse_state->idx,
+ (void *) $2, $4, 0);
+ free($4);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}
|
@@ -452,8 +529,11 @@ PE_PREFIX_MEM PE_VALUE sep_dc

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_breakpoint(list, &parse_state->idx,
- (void *) $2, NULL, 0));
+ if (parse_events_add_breakpoint(list, &parse_state->idx,
+ (void *) $2, NULL, 0)) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}

@@ -463,29 +543,35 @@ tracepoint_name opt_event_config
struct parse_events_state *parse_state = _parse_state;
struct parse_events_error *error = parse_state->error;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
if (error)
error->idx = @1.first_column;

- if (parse_events_add_tracepoint(list, &parse_state->idx, $1.sys, $1.event,
- error, $2))
- return -1;
+ err = parse_events_add_tracepoint(list, &parse_state->idx, $1.sys, $1.event,
+ error, $2);

+ parse_events_terms__delete($2);
+ free($1.sys);
+ free($1.event);
+ if (err) {
+ free(list);
+ return -1;
+ }
$$ = list;
}

tracepoint_name:
PE_NAME '-' PE_NAME ':' PE_NAME
{
- char sys_name[128];
struct tracepoint_name tracepoint;

- snprintf(&sys_name, 128, "%s-%s", $1, $3);
- tracepoint.sys = &sys_name;
+ ABORT_ON(asprintf(&tracepoint.sys, "%s-%s", $1, $3) < 0);
tracepoint.event = $5;
-
+ free($1);
+ free($3);
$$ = tracepoint;
}
|
@@ -500,11 +586,16 @@ event_legacy_numeric:
PE_VALUE ':' PE_VALUE opt_event_config
{
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_numeric(_parse_state, list, (u32)$1, $3, $4));
+ err = parse_events_add_numeric(_parse_state, list, (u32)$1, $3, $4);
parse_events_terms__delete($4);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}

@@ -512,11 +603,16 @@ event_legacy_raw:
PE_RAW opt_event_config
{
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_add_numeric(_parse_state, list, PERF_TYPE_RAW, $1, $2));
+ err = parse_events_add_numeric(_parse_state, list, PERF_TYPE_RAW, $1, $2);
parse_events_terms__delete($2);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}

@@ -525,22 +621,33 @@ PE_BPF_OBJECT opt_event_config
{
struct parse_events_state *parse_state = _parse_state;
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_load_bpf(parse_state, list, $1, false, $2));
+ err = parse_events_load_bpf(parse_state, list, $1, false, $2);
parse_events_terms__delete($2);
+ free($1);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}
|
PE_BPF_SOURCE opt_event_config
{
struct list_head *list;
+ int err;

list = alloc_list();
ABORT_ON(!list);
- ABORT_ON(parse_events_load_bpf(_parse_state, list, $1, true, $2));
+ err = parse_events_load_bpf(_parse_state, list, $1, true, $2);
parse_events_terms__delete($2);
+ if (err) {
+ free(list);
+ YYABORT;
+ }
$$ = list;
}

@@ -573,6 +680,10 @@ opt_pmu_config:
start_terms: event_config
{
struct parse_events_state *parse_state = _parse_state;
+ if (parse_state->terms) {
+ parse_events_terms__delete ($1);
+ YYABORT;
+ }
parse_state->terms = $1;
}

@@ -582,7 +693,10 @@ event_config ',' event_term
struct list_head *head = $1;
struct parse_events_term *term = $3;

- ABORT_ON(!head);
+ if (!head) {
+ free_term(term);
+ YYABORT;
+ }
list_add_tail(&term->list, head);
$$ = $1;
}
@@ -603,8 +717,12 @@ PE_NAME '=' PE_NAME
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER,
- $1, $3, &@1, &@3));
+ if (parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER,
+ $1, $3, &@1, &@3)) {
+ free($1);
+ free($3);
+ YYABORT;
+ }
$$ = term;
}
|
@@ -612,8 +730,11 @@ PE_NAME '=' PE_VALUE
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
- $1, $3, false, &@1, &@3));
+ if (parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
+ $1, $3, false, &@1, &@3)) {
+ free($1);
+ YYABORT;
+ }
$$ = term;
}
|
@@ -622,7 +743,10 @@ PE_NAME '=' PE_VALUE_SYM_HW
struct parse_events_term *term;
int config = $3 & 255;

- ABORT_ON(parse_events_term__sym_hw(&term, $1, config));
+ if (parse_events_term__sym_hw(&term, $1, config)) {
+ free($1);
+ YYABORT;
+ }
$$ = term;
}
|
@@ -630,8 +754,11 @@ PE_NAME
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
- $1, 1, true, &@1, NULL));
+ if (parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
+ $1, 1, true, &@1, NULL)) {
+ free($1);
+ YYABORT;
+ }
$$ = term;
}
|
@@ -648,7 +775,10 @@ PE_TERM '=' PE_NAME
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__str(&term, (int)$1, NULL, $3, &@1, &@3));
+ if (parse_events_term__str(&term, (int)$1, NULL, $3, &@1, &@3)) {
+ free($3);
+ YYABORT;
+ }
$$ = term;
}
|
@@ -672,9 +802,13 @@ PE_NAME array '=' PE_NAME
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER,
- $1, $4, &@1, &@4));
-
+ if (parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER,
+ $1, $4, &@1, &@4)) {
+ free($1);
+ free($4);
+ free($2.ranges);
+ YYABORT;
+ }
term->array = $2;
$$ = term;
}
@@ -683,8 +817,12 @@ PE_NAME array '=' PE_VALUE
{
struct parse_events_term *term;

- ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
- $1, $4, false, &@1, &@4));
+ if (parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
+ $1, $4, false, &@1, &@4)) {
+ free($1);
+ free($2.ranges);
+ YYABORT;
+ }
term->array = $2;
$$ = term;
}
@@ -695,8 +833,12 @@ PE_DRV_CFG_TERM
char *config = strdup($1);

ABORT_ON(!config);
- ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_DRV_CFG,
- config, $1, &@1, NULL));
+ if (parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_DRV_CFG,
+ config, $1, &@1, NULL)) {
+ free($1);
+ free(config);
+ YYABORT;
+ }
$$ = term;
}

--
2.24.0.rc1.363.gb1bccd3e3d-goog

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Next in thread: Ian Rogers: "[PATCH v5 09/10] perf tools: add a deep delete for parse event terms"
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