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diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index 7c3bc4b..d2f2f8b 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -150,16 +150,18 @@ static char *fix_snmp_range(char *th)
150{ 150{
151 double left, right; 151 double left, right;
152 char *colon, *ret; 152 char *colon, *ret;
153 if (!(colon = strchr(th, ':'))) 153
154 if ((colon = strchr(th, ':')) == NULL || *(colon + 1) == '\0')
154 return th; 155 return th;
155 *colon = 0;
156 156
157 left = strtod(th, NULL); 157 left = strtod(th, NULL);
158 right = strtod(colon + 1, NULL); 158 right = strtod(colon + 1, NULL);
159 if (right >= left) { 159 if (right >= left)
160 return th; 160 return th;
161 } 161
162 ret = malloc(strlen(th) + strlen(colon + 1) + 2); 162 if ((ret = malloc(strlen(th) + 2)) == NULL)
163 die(STATE_UNKNOWN, _("Cannot malloc"));
164 *colon = '\0';
163 sprintf(ret, "@%s:%s", colon + 1, th); 165 sprintf(ret, "@%s:%s", colon + 1, th);
164 free(th); 166 free(th);
165 return ret; 167 return ret;