[PATCH 4/4] mdadm: numbered names verification
From: Mariusz Tkaczyk <hidden>
Date: 2023-03-23 16:50:58
Subsystem:
the rest · Maintainer:
Linus Torvalds
New functions added to remove literals and make the code reusable. Use parse_num() instead of is_numer(). Signed-off-by: Mariusz Tkaczyk <redacted> --- config.c | 17 ++--------------- lib.c | 2 +- mdadm.h | 4 +++- util.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 50 insertions(+), 17 deletions(-)
diff --git a/config.c b/config.c
index e61c0496..450880e3 100644
--- a/config.c
+++ b/config.c@@ -385,17 +385,6 @@ void devline(char *line) struct mddev_ident *mddevlist = NULL; struct mddev_ident **mddevlp = &mddevlist; -static int is_number(char *w) -{ - /* check if there are 1 or more digits and nothing else */ - int digits = 0; - while (*w && isdigit(*w)) { - digits++; - w++; - } - return (digits && ! *w); -} - void arrayline(char *line) { char *w;
@@ -419,10 +408,8 @@ void arrayline(char *line) if (is_devname_ignore(w) == true || strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 || (w[0] != '/' && w[0] != '<') || - (strncmp(w, DEV_NUM_PREF, DEV_NUM_PREF_LEN) == 0 && - is_number(w + DEV_NUM_PREF_LEN)) || - (strncmp(w, "/dev/md_d", 9) == 0 && - is_number(w + 9))) { + is_devname_md_numbered(w) == true || + is_devname_md_d_numbered(w) == true) { /* This is acceptable */; if (mis.devname) pr_err("only give one device per ARRAY line: %s and %s\n",
diff --git a/lib.c b/lib.c
index 65ea51e0..fe5c8d2c 100644
--- a/lib.c
+++ b/lib.c@@ -570,7 +570,7 @@ void free_line(char *line) * * Return: 0 on success, 1 otherwise. */ -int parse_num(int *dest, char *num) +int parse_num(int *dest, const char *num) { char *c = NULL; long temp;
diff --git a/mdadm.h b/mdadm.h
index 87fd4a57..b5d58448 100644
--- a/mdadm.h
+++ b/mdadm.h@@ -1599,7 +1599,7 @@ int default_layout(struct supertype *st, int level, int verbose); extern int is_near_layout_10(int layout); extern int parse_layout_10(char *layout); extern int parse_layout_faulty(char *layout); -extern int parse_num(int *dest, char *num); +extern int parse_num(int *dest, const char *num); extern int parse_cluster_confirm_arg(char *inp, char **devname, int *slot); extern int check_ext2(int fd, char *name); extern int check_reiser(int fd, char *name);
@@ -1649,6 +1649,8 @@ extern int use_udev(void); extern unsigned long GCD(unsigned long a, unsigned long b); extern int conf_name_is_free(char *name); extern bool is_devname_ignore(char *devname); +extern bool is_devname_md_numbered(const char *devname); +extern bool is_devname_md_d_numbered(const char *devname); extern int conf_verify_devnames(struct mddev_ident *array_list); extern int devname_matches(char *name, char *match); extern struct mddev_ident *conf_match(struct supertype *st,
diff --git a/util.c b/util.c
index 9f1e1f7c..23372b7e 100644
--- a/util.c
+++ b/util.c@@ -973,6 +973,50 @@ dev_t devnm2devid(char *devnm) return 0; } +/** + * is_devname_numbered() - helper for numbered devname verification. + * @devname: path or name to check. + * @pref: expected devname prefix. + * @pref_len: prefix len. + */ +static bool is_devname_numbered(const char *devname, const char *pref, const int pref_len) +{ + int val; + + assert(devname && pref); + + if (strncmp(devname, pref, pref_len) != 0) + return false; + + if (parse_num(&val, devname + pref_len) != 0) + return false; + + if (val > 127) + return false; + + return true; +} + +/** + * is_devname_md_numbered() - check if &devname is numbered MD device (md). + * @devname: path or name to check. + */ +bool is_devname_md_numbered(const char *devname) +{ + return is_devname_numbered(devname, DEV_NUM_PREF, DEV_NUM_PREF_LEN); +} + +/** + * is_devname_md_d_numbered() - check if &devname is secondary numbered MD device (md_d). + * @devname: path or name to check. + */ +bool is_devname_md_d_numbered(const char *devname) +{ + static const char d_dev[] = DEV_NUM_PREF "_d"; + + return is_devname_numbered(devname, d_dev, sizeof(d_dev) - 1); +} + /** * get_md_name() - Get main dev node of the md device. * @devnm: Md device name or path.
--
2.26.2