Merge pull request #3735 from brauner/2021-03-26/fixes_2

oss-fuzz: fixes

src/lxc/conf.c

@@ -3742,7 +3742,7 @@ int lxc_clear_limits(struct lxc_conf *c, const char *key)
 	else if (strnequal(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")))
 		k = key + STRLITERALLEN("lxc.prlimit.");
 	else
-		return -1;
+		return ret_errno(EINVAL);
 
 	lxc_list_for_each_safe (it, &c->limits, next) {
 		struct lxc_limit *lim = it->elem;
@@ -3751,11 +3751,14 @@ int lxc_clear_limits(struct lxc_conf *c, const char *key)
 			continue;
 
 		lxc_list_del(it);
-		free(lim->resource);
+
+		free_disarm(lim->resource);
 		free(lim);
-		free(it);
 	}
 
+	if (all)
+		lxc_list_init(&c->limits);
+
 	return 0;
 }
 

src/lxc/confile.c

@@ -2667,6 +2667,10 @@ static int set_config_rootfs_options(const char *key, const char *value,
 	struct lxc_rootfs *rootfs = &lxc_conf->rootfs;
 	int ret;
 
+	clr_config_rootfs_options(key, lxc_conf, data);
+	if (lxc_config_value_empty(value))
+		return 0;
+
 	ret = parse_mntopts(value, &mflags, &mdata);
 	if (ret < 0)
 		return ret_errno(EINVAL);

src/lxc/confile_utils.c

@@ -1024,17 +1024,31 @@ static int sig_num(const char *sig)
 
 static int rt_sig_num(const char *signame)
 {
-	int rtmax = 0, sig_n = 0;
+	bool rtmax;
+	int sig_n = 0;
 
-	if (strncasecmp(signame, "max-", 4) == 0)
+	if (is_empty_string(signame))
-		rtmax = 1;
+		return ret_errno(EINVAL);
 
-	signame += 4;
+	if (strncasecmp(signame, "max-", STRLITERALLEN("max-")) == 0) {
-	if (!isdigit(*signame))
+		rtmax = true;
+		signame += STRLITERALLEN("max-");
+	} else if (strncasecmp(signame, "min+", STRLITERALLEN("min+")) == 0) {
+		rtmax = false;
+		signame += STRLITERALLEN("min+");
+	} else {
+		return ret_errno(EINVAL);
+	}
+
+	if (is_empty_string(signame) || !isdigit(*signame))
 		return ret_errno(EINVAL);
 
 	sig_n = sig_num(signame);
-	sig_n = rtmax ? SIGRTMAX - sig_n : SIGRTMIN + sig_n;
+	if (rtmax)
+		sig_n = SIGRTMAX - sig_n;
+	else
+		sig_n = SIGRTMIN + sig_n;
+
 	if (sig_n > SIGRTMAX || sig_n < SIGRTMIN)
 		return ret_errno(EINVAL);
 
@@ -1043,16 +1057,15 @@ static int rt_sig_num(const char *signame)
 
 int sig_parse(const char *signame)
 {
-	size_t n;
+	if (isdigit(*signame))
-
-	if (isdigit(*signame)) {
 		return sig_num(signame);
-	} else if (strncasecmp(signame, "sig", 3) == 0) {
-		signame += 3;
-		if (strncasecmp(signame, "rt", 2) == 0)
-			return rt_sig_num(signame + 2);
 
-		for (n = 0; n < sizeof(signames) / sizeof((signames)[0]); n++)
+	if (strncasecmp(signame, "sig", STRLITERALLEN("sig")) == 0) {
+		signame += STRLITERALLEN("sig");
+		if (strncasecmp(signame, "rt", STRLITERALLEN("rt")) == 0)
+			return rt_sig_num(signame + STRLITERALLEN("rt"));
+
+		for (size_t n = 0; n < ARRAY_SIZE(signames); n++)
 			if (strcasecmp(signames[n].name, signame) == 0)
 				return signames[n].num;
 	}