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Date: Tue, 10 May 2016 13:34:11 -0700
From: tip-bot for Masami Hiramatsu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: acme@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
tglx@...utronix.de, mhiramat@...nel.org, namhyung@...nel.org,
mingo@...nel.org, peterz@...radead.org
Subject: [tip:perf/core] perf probe: Check the return value of strbuf APIs
Commit-ID: bf4d5f25c90bf2eca8671f2fc4e3d15919cd7f9c
Gitweb: http://git.kernel.org/tip/bf4d5f25c90bf2eca8671f2fc4e3d15919cd7f9c
Author: Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Tue, 10 May 2016 14:47:07 +0900
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 10 May 2016 11:53:34 -0300
perf probe: Check the return value of strbuf APIs
Check the return value of strbuf APIs in perf-probe
related code, so that it can handle errors in strbuf.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20160510054707.6158.69861.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/dwarf-aux.c | 52 +++++++--------
tools/perf/util/probe-event.c | 143 +++++++++++++++++++++++++----------------
tools/perf/util/probe-finder.c | 30 +++++----
3 files changed, 128 insertions(+), 97 deletions(-)
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index aea189b..a347b19 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -915,8 +915,7 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
tmp = "*";
else if (tag == DW_TAG_subroutine_type) {
/* Function pointer */
- strbuf_add(buf, "(function_type)", 15);
- return 0;
+ return strbuf_add(buf, "(function_type)", 15);
} else {
if (!dwarf_diename(&type))
return -ENOENT;
@@ -927,14 +926,10 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
else if (tag == DW_TAG_enumeration_type)
tmp = "enum ";
/* Write a base name */
- strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
- return 0;
+ return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
}
ret = die_get_typename(&type, buf);
- if (ret == 0)
- strbuf_addstr(buf, tmp);
-
- return ret;
+ return ret ? ret : strbuf_addstr(buf, tmp);
}
/**
@@ -951,12 +946,10 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
ret = die_get_typename(vr_die, buf);
if (ret < 0) {
pr_debug("Failed to get type, make it unknown.\n");
- strbuf_add(buf, " (unknown_type)", 14);
+ ret = strbuf_add(buf, " (unknown_type)", 14);
}
- strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
-
- return 0;
+ return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
}
#ifdef HAVE_DWARF_GETLOCATIONS
@@ -999,22 +992,24 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
}
while ((offset = dwarf_ranges(&scopes[1], offset, &base,
- &start, &end)) > 0) {
+ &start, &end)) > 0) {
start -= entry;
end -= entry;
if (first) {
- strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
- name, start, end);
+ ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+ name, start, end);
first = false;
} else {
- strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
- start, end);
+ ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+ start, end);
}
+ if (ret < 0)
+ goto out;
}
if (!first)
- strbuf_add(buf, "]>", 2);
+ ret = strbuf_add(buf, "]>", 2);
out:
free(scopes);
@@ -1054,31 +1049,32 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
return -EINVAL;
- while ((offset = dwarf_getlocations(
- &attr, offset, &base,
- &start, &end, &op, &nops)) > 0) {
+ while ((offset = dwarf_getlocations(&attr, offset, &base,
+ &start, &end, &op, &nops)) > 0) {
if (start == 0) {
/* Single Location Descriptions */
ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
- return ret;
+ goto out;
}
/* Location Lists */
start -= entry;
end -= entry;
if (first) {
- strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
- name, start, end);
+ ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+ name, start, end);
first = false;
} else {
- strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
- start, end);
+ ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+ start, end);
}
+ if (ret < 0)
+ goto out;
}
if (!first)
- strbuf_add(buf, "]>", 2);
-
+ ret = strbuf_add(buf, "]>", 2);
+out:
return ret;
}
#else
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index c82c625..74401a2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1677,28 +1677,37 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
{
struct perf_probe_arg_field *field = pa->field;
struct strbuf buf;
- char *ret;
+ char *ret = NULL;
+ int err;
+
+ if (strbuf_init(&buf, 64) < 0)
+ return NULL;
- strbuf_init(&buf, 64);
if (pa->name && pa->var)
- strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
+ err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
else
- strbuf_addstr(&buf, pa->name ?: pa->var);
+ err = strbuf_addstr(&buf, pa->name ?: pa->var);
+ if (err)
+ goto out;
while (field) {
if (field->name[0] == '[')
- strbuf_addstr(&buf, field->name);
+ err = strbuf_addstr(&buf, field->name);
else
- strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
- field->name);
+ err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
+ field->name);
field = field->next;
+ if (err)
+ goto out;
}
if (pa->type)
- strbuf_addf(&buf, ":%s", pa->type);
+ if (strbuf_addf(&buf, ":%s", pa->type) < 0)
+ goto out;
ret = strbuf_detach(&buf, NULL);
-
+out:
+ strbuf_release(&buf);
return ret;
}
@@ -1706,18 +1715,23 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
{
struct strbuf buf;
- char *tmp;
- int len;
+ char *tmp, *ret = NULL;
+ int len, err = 0;
+
+ if (strbuf_init(&buf, 64) < 0)
+ return NULL;
- strbuf_init(&buf, 64);
if (pp->function) {
- strbuf_addstr(&buf, pp->function);
+ if (strbuf_addstr(&buf, pp->function) < 0)
+ goto out;
if (pp->offset)
- strbuf_addf(&buf, "+%lu", pp->offset);
+ err = strbuf_addf(&buf, "+%lu", pp->offset);
else if (pp->line)
- strbuf_addf(&buf, ":%d", pp->line);
+ err = strbuf_addf(&buf, ":%d", pp->line);
else if (pp->retprobe)
- strbuf_addstr(&buf, "%return");
+ err = strbuf_addstr(&buf, "%return");
+ if (err)
+ goto out;
}
if (pp->file) {
tmp = pp->file;
@@ -1726,12 +1740,15 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
tmp = strchr(pp->file + len - 30, '/');
tmp = tmp ? tmp + 1 : pp->file + len - 30;
}
- strbuf_addf(&buf, "@%s", tmp);
- if (!pp->function && pp->line)
- strbuf_addf(&buf, ":%d", pp->line);
+ err = strbuf_addf(&buf, "@%s", tmp);
+ if (!err && !pp->function && pp->line)
+ err = strbuf_addf(&buf, ":%d", pp->line);
}
-
- return strbuf_detach(&buf, NULL);
+ if (!err)
+ ret = strbuf_detach(&buf, NULL);
+out:
+ strbuf_release(&buf);
+ return ret;
}
#if 0
@@ -1762,28 +1779,30 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev)
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
struct strbuf *buf, int depth)
{
+ int err;
if (ref->next) {
depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
depth + 1);
if (depth < 0)
- goto out;
+ return depth;
}
- strbuf_addf(buf, "%+ld(", ref->offset);
-out:
- return depth;
+ err = strbuf_addf(buf, "%+ld(", ref->offset);
+ return (err < 0) ? err : depth;
}
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
struct strbuf *buf)
{
struct probe_trace_arg_ref *ref = arg->ref;
- int depth = 0;
+ int depth = 0, err;
/* Argument name or separator */
if (arg->name)
- strbuf_addf(buf, " %s=", arg->name);
+ err = strbuf_addf(buf, " %s=", arg->name);
else
- strbuf_addch(buf, ' ');
+ err = strbuf_addch(buf, ' ');
+ if (err)
+ return err;
/* Special case: @XXX */
if (arg->value[0] == '@' && arg->ref)
@@ -1798,18 +1817,19 @@ static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
/* Print argument value */
if (arg->value[0] == '@' && arg->ref)
- strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
+ err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
else
- strbuf_addstr(buf, arg->value);
+ err = strbuf_addstr(buf, arg->value);
/* Closing */
- while (depth--)
- strbuf_addch(buf, ')');
+ while (!err && depth--)
+ err = strbuf_addch(buf, ')');
+
/* Print argument type */
- if (arg->type)
- strbuf_addf(buf, ":%s", arg->type);
+ if (!err && arg->type)
+ err = strbuf_addf(buf, ":%s", arg->type);
- return 0;
+ return err;
}
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
@@ -1817,15 +1837,18 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
struct probe_trace_point *tp = &tev->point;
struct strbuf buf;
char *ret = NULL;
- int i;
+ int i, err;
/* Uprobes must have tp->module */
if (tev->uprobes && !tp->module)
return NULL;
- strbuf_init(&buf, 32);
- strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
- tev->group, tev->event);
+ if (strbuf_init(&buf, 32) < 0)
+ return NULL;
+
+ if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
+ tev->group, tev->event) < 0)
+ goto error;
/*
* If tp->address == 0, then this point must be a
* absolute address uprobe.
@@ -1839,14 +1862,16 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
/* Use the tp->address for uprobes */
if (tev->uprobes)
- strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
+ err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
else if (!strncmp(tp->symbol, "0x", 2))
/* Absolute address. See try_to_find_absolute_address() */
- strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
- tp->module ? ":" : "", tp->address);
+ err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
+ tp->module ? ":" : "", tp->address);
else
- strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
- tp->module ? ":" : "", tp->symbol, tp->offset);
+ err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
+ tp->module ? ":" : "", tp->symbol, tp->offset);
+ if (err)
+ goto error;
for (i = 0; i < tev->nargs; i++)
if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
@@ -1960,14 +1985,15 @@ static int convert_to_perf_probe_event(struct probe_trace_event *tev,
if (tev->args[i].name)
pev->args[i].name = strdup(tev->args[i].name);
else {
- strbuf_init(&buf, 32);
+ if ((ret = strbuf_init(&buf, 32)) < 0)
+ goto error;
ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
pev->args[i].name = strbuf_detach(&buf, NULL);
}
if (pev->args[i].name == NULL && ret >= 0)
ret = -ENOMEM;
}
-
+error:
if (ret < 0)
clear_perf_probe_event(pev);
@@ -2140,37 +2166,40 @@ static int perf_probe_event__sprintf(const char *group, const char *event,
const char *module,
struct strbuf *result)
{
- int i;
+ int i, ret;
char *buf;
if (asprintf(&buf, "%s:%s", group, event) < 0)
return -errno;
- strbuf_addf(result, " %-20s (on ", buf);
+ ret = strbuf_addf(result, " %-20s (on ", buf);
free(buf);
+ if (ret)
+ return ret;
/* Synthesize only event probe point */
buf = synthesize_perf_probe_point(&pev->point);
if (!buf)
return -ENOMEM;
- strbuf_addstr(result, buf);
+ ret = strbuf_addstr(result, buf);
free(buf);
- if (module)
- strbuf_addf(result, " in %s", module);
+ if (!ret && module)
+ ret = strbuf_addf(result, " in %s", module);
- if (pev->nargs > 0) {
- strbuf_add(result, " with", 5);
- for (i = 0; i < pev->nargs; i++) {
+ if (!ret && pev->nargs > 0) {
+ ret = strbuf_add(result, " with", 5);
+ for (i = 0; !ret && i < pev->nargs; i++) {
buf = synthesize_perf_probe_arg(&pev->args[i]);
if (!buf)
return -ENOMEM;
- strbuf_addf(result, " %s", buf);
+ ret = strbuf_addf(result, " %s", buf);
free(buf);
}
}
- strbuf_addch(result, ')');
+ if (!ret)
+ ret = strbuf_addch(result, ')');
- return 0;
+ return ret;
}
/* Show an event */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 9f68875..1259839 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1294,6 +1294,7 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
{
struct available_var_finder *af = data;
struct variable_list *vl;
+ struct strbuf buf = STRBUF_INIT;
int tag, ret;
vl = &af->vls[af->nvls - 1];
@@ -1307,25 +1308,26 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
if (ret == 0 || ret == -ERANGE) {
int ret2;
bool externs = !af->child;
- struct strbuf buf;
- strbuf_init(&buf, 64);
+ if (strbuf_init(&buf, 64) < 0)
+ goto error;
if (probe_conf.show_location_range) {
- if (!externs) {
- if (ret)
- strbuf_add(&buf, "[INV]\t", 6);
- else
- strbuf_add(&buf, "[VAL]\t", 6);
- } else
- strbuf_add(&buf, "[EXT]\t", 6);
+ if (!externs)
+ ret2 = strbuf_add(&buf,
+ ret ? "[INV]\t" : "[VAL]\t", 6);
+ else
+ ret2 = strbuf_add(&buf, "[EXT]\t", 6);
+ if (ret2)
+ goto error;
}
ret2 = die_get_varname(die_mem, &buf);
if (!ret2 && probe_conf.show_location_range &&
!externs) {
- strbuf_addch(&buf, '\t');
+ if (strbuf_addch(&buf, '\t') < 0)
+ goto error;
ret2 = die_get_var_range(&af->pf.sp_die,
die_mem, &buf);
}
@@ -1334,8 +1336,8 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
if (ret2 == 0) {
strlist__add(vl->vars,
strbuf_detach(&buf, NULL));
- } else
- strbuf_release(&buf);
+ }
+ strbuf_release(&buf);
}
}
@@ -1343,6 +1345,10 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
return DIE_FIND_CB_CONTINUE;
else
return DIE_FIND_CB_SIBLING;
+error:
+ strbuf_release(&buf);
+ pr_debug("Error in strbuf\n");
+ return DIE_FIND_CB_END;
}
/* Add a found vars into available variables list */
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