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path: root/net/ipv4/sysctl_net_ipv4.c
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Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 0902cb32bbad..fcb2cd167f64 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -340,6 +340,10 @@ static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
user_key[i * 4 + 1],
user_key[i * 4 + 2],
user_key[i * 4 + 3]);
+
+ if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
+ break;
+
if (i + 1 < n_keys)
off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
}