From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux@rasmusvillemoes.dk
Subject: [PATCH 08/12] parse_integer: convert mm/
Date: Fri, 8 May 2015 21:35:57 +0300 [thread overview]
Message-ID: <20150508183557.GF9182@p183.telecom.by> (raw)
In-Reply-To: <20150508182911.GA9044@p183.telecom.by>
Convert mm/ directory away from deprecated simple_strto*() interface.
One thing to note about parse_integer() and seemingly useless casts --
range of accepted values depends on result type.
int val;
parse_integer(s, 0, &val);
will accept negative integers, while
int val;
parse_integer(s, 0, (unsigned int *)&val);
will accept only 0 and positive integers.
Cast is needed when result variable has to be of different type
for some reason.
This is very important and hopefully [knocks wood] obvious.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
mm/memcontrol.c | 19 +++++++++++--------
mm/memtest.c | 2 +-
mm/page_alloc.c | 2 +-
mm/shmem.c | 14 ++++++++------
4 files changed, 21 insertions(+), 16 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 14c2f20..06a920d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4096,20 +4096,23 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
struct fd efile;
struct fd cfile;
const char *name;
- char *endp;
int ret;
buf = strstrip(buf);
- efd = simple_strtoul(buf, &endp, 10);
- if (*endp != ' ')
+ ret = parse_integer(buf, 10, &efd);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ if (*buf++ != ' ')
return -EINVAL;
- buf = endp + 1;
-
- cfd = simple_strtoul(buf, &endp, 10);
- if ((*endp != ' ') && (*endp != '\0'))
+ ret = parse_integer(buf, 10, &efd);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ if (*buf != ' ' && *buf != '\0')
return -EINVAL;
- buf = endp + 1;
+ buf++;
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
diff --git a/mm/memtest.c b/mm/memtest.c
index 1997d93..e5e2914 100644
--- a/mm/memtest.c
+++ b/mm/memtest.c
@@ -93,7 +93,7 @@ static int memtest_pattern __initdata;
static int __init parse_memtest(char *arg)
{
if (arg)
- memtest_pattern = simple_strtoul(arg, NULL, 0);
+ parse_integer(arg, 0, (unsigned int *)&memtest_pattern);
else
memtest_pattern = ARRAY_SIZE(patterns);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ebffa0e..c3528a3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6020,7 +6020,7 @@ static int __init set_hashdist(char *str)
{
if (!str)
return 0;
- hashdist = simple_strtoul(str, &str, 0);
+ parse_integer(str, 0, (unsigned int *)&hashdist);
return 1;
}
__setup("hashdist=", set_hashdist);
diff --git a/mm/shmem.c b/mm/shmem.c
index de98137..5ce525d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2742,6 +2742,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
struct mempolicy *mpol = NULL;
uid_t uid;
gid_t gid;
+ int rv;
while (options != NULL) {
this_char = options;
@@ -2795,14 +2796,15 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
} else if (!strcmp(this_char,"mode")) {
if (remount)
continue;
- sbinfo->mode = simple_strtoul(value, &rest, 8) & 07777;
- if (*rest)
+ rv = parse_integer(value, 8, &sbinfo->mode);
+ if (rv < 0 || value[rv])
goto bad_val;
+ sbinfo->mode &= 07777;
} else if (!strcmp(this_char,"uid")) {
if (remount)
continue;
- uid = simple_strtoul(value, &rest, 0);
- if (*rest)
+ rv = parse_integer(value, 0, &uid);
+ if (rv < 0 || value[rv])
goto bad_val;
sbinfo->uid = make_kuid(current_user_ns(), uid);
if (!uid_valid(sbinfo->uid))
@@ -2810,8 +2812,8 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
} else if (!strcmp(this_char,"gid")) {
if (remount)
continue;
- gid = simple_strtoul(value, &rest, 0);
- if (*rest)
+ rv = parse_integer(value, 0, &gid);
+ if (rv < 0 || value[rv])
goto bad_val;
sbinfo->gid = make_kgid(current_user_ns(), gid);
if (!gid_valid(sbinfo->gid))
--
2.0.4
next prev parent reply other threads:[~2015-05-08 18:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-08 18:29 [PATCH 01/12] kstrto*: accept "-0" for signed conversion Alexey Dobriyan
2015-05-08 18:30 ` [PATCH 02/12] Add parse_integer() (replacement for simple_strto*()) Alexey Dobriyan
2015-05-08 20:46 ` Andrew Morton
2015-05-08 21:52 ` Rasmus Villemoes
2015-05-10 13:52 ` Alexey Dobriyan
2015-05-13 12:19 ` Alexey Dobriyan
2015-05-10 15:52 ` Noel Grandin
2015-07-09 19:28 ` Andrew Morton
2015-07-10 6:46 ` Alexey Dobriyan
2015-05-08 18:31 ` [PATCH 03/12] parse_integer: add runtime testsuite Alexey Dobriyan
2015-05-08 18:33 ` [PATCH 04/12] parse-integer: rewrite kstrto*() Alexey Dobriyan
2015-05-08 18:33 ` [PATCH 05/12] parse_integer: convert scanf() Alexey Dobriyan
2015-05-08 18:34 ` [PATCH 06/12] scanf: fix type range overflow Alexey Dobriyan
2015-05-08 18:35 ` [PATCH 07/12] parse_integer: convert lib/ Alexey Dobriyan
2015-05-08 18:35 ` Alexey Dobriyan [this message]
2015-05-08 18:36 ` [PATCH 09/12] parse_integer: convert fs/ Alexey Dobriyan
2015-05-08 18:37 ` [PATCH 10/37] parse_integer: convert fs/cachefiles/ Alexey Dobriyan
2015-05-08 18:39 ` [PATCH 11/12] parse_integer: convert ext2, ext3, ext4 Alexey Dobriyan
2015-05-08 18:40 ` [PATCH 12/12] parse_integer: convert fs/ocfs2/ Alexey Dobriyan
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