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udev: use readlink_malloc() or its friend

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Follow-up for a2554acec652fc65c8ed0c6c1fede9ba8c3693b1 and
70068602713e8f441c5ddc2618f007f24488e422.
This commit is contained in:
Yu Watanabe 2018-10-13 23:28:02 +09:00 committed by Lennart Poettering
parent 18094bdcf4
commit e7aa9512e4
2 changed files with 19 additions and 28 deletions
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10
src/udev/udev-node.c
View File

@ -49,20 +49,16 @@ static int node_symlink(sd_device *dev, const char *node, const char *slink) {
log_error("Conflicting device node '%s' found, link to '%s' will not be created.", slink, node);
return -EOPNOTSUPP;
} else if (S_ISLNK(stats.st_mode)) {
char buf[PATH_MAX];
ssize_t len;
_cleanup_free_ char *buf = NULL;
len = readlink(slink, buf, sizeof(buf));
if (len > 0 && len < (ssize_t) sizeof(buf)) {
buf[len] = '\0';
if (streq(target, buf)) {
if (readlink_malloc(slink, &buf) >= 0 &&
streq(target, buf)) {
log_debug("Preserve already existing symlink '%s' to '%s'", slink, target);
(void) label_fix(slink, LABEL_IGNORE_ENOENT);
(void) utimensat(AT_FDCWD, slink, NULL, AT_SYMLINK_NOFOLLOW);
return 0;
}
}
}
} else {
log_debug("Creating symlink '%s' to '%s'", slink, target);
do {

29
src/udev/udev-watch.c
View File

@ -7,8 +7,10 @@
#include <sys/inotify.h>
#include <unistd.h>
#include "alloc-util.h"
#include "device-private.h"
#include "dirent-util.h"
#include "fs-util.h"
#include "mkdir.h"
#include "stdio-util.h"
#include "udev-watch.h"
@ -48,21 +50,16 @@ int udev_watch_restore(void) {
FOREACH_DIRENT_ALL(ent, dir, break) {
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
char device[PATH_MAX];
ssize_t len;
_cleanup_free_ char *device = NULL;
if (ent->d_name[0] == '.')
continue;
len = readlinkat(dirfd(dir), ent->d_name, device, sizeof(device));
if (len <= 0) {
log_error_errno(errno, "Failed to read link '/run/udev/watch.old/%s', ignoring: %m", ent->d_name);
goto unlink;
} else if (len >= (ssize_t) sizeof(device)) {
log_error("Path specified by link '/run/udev/watch.old/%s' is truncated, ignoring.", ent->d_name);
r = readlinkat_malloc(dirfd(dir), ent->d_name, &device);
if (r < 0) {
log_error_errno(r, "Failed to read link '/run/udev/watch.old/%s', ignoring: %m", ent->d_name);
goto unlink;
}
device[len] = '\0';
r = sd_device_new_from_device_id(&dev, device);
if (r < 0) {
@ -152,8 +149,8 @@ int udev_watch_end(sd_device *dev) {
}
int udev_watch_lookup(int wd, sd_device **ret) {
char filename[STRLEN("/run/udev/watch/") + DECIMAL_STR_MAX(int)], device[PATH_MAX];
ssize_t len;
char filename[STRLEN("/run/udev/watch/") + DECIMAL_STR_MAX(int)];
_cleanup_free_ char *device = NULL;
int r;
assert(ret);
@ -165,14 +162,12 @@ int udev_watch_lookup(int wd, sd_device **ret) {
return log_error_errno(EINVAL, "Invalid watch handle.");
xsprintf(filename, "/run/udev/watch/%d", wd);
len = readlink(filename, device, sizeof(device));
if (len <= 0) {
if (errno != ENOENT)
r = readlink_malloc(filename, &device);
if (r < 0) {
if (r != -ENOENT)
return log_error_errno(errno, "Failed to read link '%s': %m", filename);
return 0;
} else if (len >= (ssize_t) sizeof(device))
return log_error_errno(ENAMETOOLONG, "Path specified by link '%s' is truncated.", filename);
device[len] = '\0';
}
r = sd_device_new_from_device_id(ret, device);
if (r < 0)