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mdev: fix the case when move rule deletes node with name == device_name

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Signed-off-by: Jean Wolter <jw5@os.inf.tu-dresden.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-06-22 01:31:12 +02:00
parent b0bee2b0da
commit 2f86ca1350
2 changed files with 43 additions and 19 deletions
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36
util-linux/mdev.c
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@ -319,22 +319,20 @@ static void make_device(char *path, int delete)
/* "Execute" the line we found */
if (!delete && major >= 0) {
if (ENABLE_FEATURE_MDEV_RENAME)
unlink(device_name);
if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg_and_die("mknod %s", device_name);
char *node_name = (char *)device_name;
if (ENABLE_FEATURE_MDEV_RENAME && alias)
alias = node_name = build_alias(alias, device_name);
if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg_and_die("mknod %s", node_name);
if (major == root_major && minor == root_minor)
symlink(device_name, "root");
symlink(node_name, "root");
if (ENABLE_FEATURE_MDEV_CONF) {
chmod(device_name, mode);
chown(device_name, ugid.uid, ugid.gid);
chmod(node_name, mode);
chown(node_name, ugid.uid, ugid.gid);
}
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
alias = build_alias(alias, device_name);
/* move the device, and optionally
* make a symlink to moved device node */
if (rename(device_name, alias) == 0 && aliaslink == '>')
symlink(alias, device_name);
if (aliaslink == '>')
symlink(node_name, device_name);
free(alias);
}
}
@ -355,15 +353,15 @@ static void make_device(char *path, int delete)
}
if (delete) {
unlink(device_name);
/* At creation time, device might have been moved
* and a symlink might have been created. Undo that. */
char *node_name = (char *)device_name;
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
alias = build_alias(alias, device_name);
unlink(alias);
free(alias);
alias = node_name = build_alias(alias, device_name);
if (aliaslink == '>')
unlink(device_name);
}
unlink(node_name);
if (ENABLE_FEATURE_MDEV_RENAME)
free(alias);
}
/* We found matching line.