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Date: Tue, 06 Mar 2007 20:22:13 +0100
From: Martin Peschke <mp3@...ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
Wu Fengguang <wfg@...l.ustc.edu.cn>
Subject: [Patch 2/2] add for_each_substring() and match_substring() -
exploitation
simplifying statistics code by using for_each_substring() and
match_substring() instead of strsep() and match_token()
Signed-off-by: Martin Peschke <mp3@...ibm.com>
---
statistic.c | 67 +++++++++++++++++-------------------------------------------
1 file changed, 20 insertions(+), 47 deletions(-)
Index: linux/lib/statistic.c
===================================================================
--- linux.orig/lib/statistic.c
+++ linux/lib/statistic.c
@@ -469,18 +469,13 @@ static int statistic_parse_single(struct
{
struct statistic_discipline *disc = &statistic_discs[type];
int prev_state = stat->state, retval = 0;
- char *copy;
if (info->flags & STATISTIC_FLAGS_NOFLEX && stat->type != type &&
def != info->defaults)
return -EINVAL;
- if (disc->parse) {
- copy = kstrdup(def, GFP_KERNEL);
- if (unlikely(!copy))
- return -ENOMEM;
- retval = disc->parse(stat, info, type, copy);
- kfree(copy);
- } else if (type != stat->type)
+ if (disc->parse)
+ retval = disc->parse(stat, info, type, def);
+ else if (type != stat->type)
statistic_transition(stat, info, STATISTIC_STATE_UNCONFIGURED);
if (!retval) {
stat->type = type;
@@ -500,30 +495,22 @@ static int statistic_parse_match(struct
struct statistic_info *info, char *def)
{
int type, len;
- char *p, *copy, *twisted;
- substring_t args[MAX_OPT_ARGS];
+ substring_t args[MAX_OPT_ARGS], sub;
struct statistic_discipline *disc;
if (!def)
def = info->defaults;
- twisted = copy = kstrdup(def, GFP_KERNEL);
- if (unlikely(!copy))
- return -ENOMEM;
- while ((p = strsep(&twisted, " ")) != NULL) {
- if (!*p)
- continue;
- if (match_token(p, statistic_match_type, args) != 1)
+ for_each_substring(&sub, def, " ") {
+ if (match_substring(&sub, statistic_match_type, args) != 1)
continue;
- len = (args[0].to - args[0].from) + 1;
+ len = (args[0].to - args[0].from);
for (type = 0; type < STAT_NONE; type++) {
disc = &statistic_discs[type];
if (unlikely(strncmp(disc->name, args[0].from, len)))
continue;
- kfree(copy);
return statistic_parse_single(stat, info, def, type);
}
}
- kfree(copy);
if (unlikely(stat->type == STAT_NONE))
return -EINVAL;
return statistic_parse_single(stat, info, def, stat->type);
@@ -543,8 +530,8 @@ static match_table_t statistic_match_com
static void statistic_parse_line(struct statistic_interface *interface,
char *def)
{
- char *p, *copy, *twisted, *name = NULL;
- substring_t args[MAX_OPT_ARGS];
+ char *name = NULL;
+ substring_t args[MAX_OPT_ARGS], sub;
int token, reset = 0, defaults = 0, i;
int state = STATISTIC_STATE_INVALID;
struct statistic *stat = interface->stat;
@@ -552,14 +539,8 @@ static void statistic_parse_line(struct
if (unlikely(!def))
return;
- twisted = copy = kstrdup(def, GFP_KERNEL);
- if (unlikely(!copy))
- return;
-
- while ((p = strsep(&twisted, " ")) != NULL) {
- if (!*p)
- continue;
- token = match_token(p, statistic_match_common, args);
+ for_each_substring(&sub, def, " ") {
+ token = match_substring(&sub, statistic_match_common, args);
switch (token) {
case STATISTIC_STATE_UNCONFIGURED:
case STATISTIC_STATE_RELEASED:
@@ -591,7 +572,6 @@ static void statistic_parse_line(struct
statistic_reset(stat, info);
}
}
- kfree(copy);
kfree(name);
}
@@ -1113,16 +1093,13 @@ static int statistic_parse_histogram(str
struct statistic_info *info,
int type, char *def)
{
- char *p;
- substring_t args[MAX_OPT_ARGS];
+ substring_t args[MAX_OPT_ARGS], sub;
int token, got_entries = 0, got_interval = 0, got_range = 0;
u32 entries, base_interval;
s64 range_min;
- while ((p = strsep(&def, " ")) != NULL) {
- if (!*p)
- continue;
- token = match_token(p, statistic_match_histogram, args);
+ for_each_substring(&sub, def, " ") {
+ token = match_substring(&sub, statistic_match_histogram, args);
switch (token) {
case 1:
match_int(&args[0], &entries);
@@ -1311,18 +1288,14 @@ static int statistic_parse_sparse(struct
struct statistic_info *info,
int type, char *def)
{
- char *p;
- substring_t args[MAX_OPT_ARGS];
+ substring_t args[MAX_OPT_ARGS], sub;
- while ((p = strsep(&def, " ")) != NULL) {
- if (!*p)
+ for_each_substring(&sub, def, " ") {
+ if (match_substring(&sub, statistic_match_sparse, args) != 1)
continue;
- if (match_token(p, statistic_match_sparse, args) == 1) {
- statistic_transition(stat, info,
- STATISTIC_STATE_UNCONFIGURED);
- match_int(&args[0], &stat->u.sparse.entries_max);
- return 0;
- }
+ statistic_transition(stat, info, STATISTIC_STATE_UNCONFIGURED);
+ match_int(&args[0], &stat->u.sparse.entries_max);
+ return 0;
}
return -EINVAL;
}
-
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