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-rw-r--r--nss/getent.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/nss/getent.c b/nss/getent.c
index 8a3c864..05ea808 100644
--- a/nss/getent.c
+++ b/nss/getent.c
@@ -788,8 +788,12 @@ services_keys (int number, char *key[])
if (proto != NULL)
*proto++ = '\0';
- if (isdigit (key[i][0]))
- serv = getservbyport (htons (atol (key[i])), proto);
+ char *endptr;
+ long port = strtol (key[i], &endptr, 10);
+
+ if (isdigit (key[i][0]) && *endptr == '\0'
+ && 0 <= port && port <= 65535)
+ serv = getservbyport (htons (port), proto);
else
serv = getservbyname (key[i], proto);