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-rw-r--r--extensions/libxt_TCPMSS.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extensions/libxt_TCPMSS.c b/extensions/libxt_TCPMSS.c
index 2227eb48..9b62a56b 100644
--- a/extensions/libxt_TCPMSS.c
+++ b/extensions/libxt_TCPMSS.c
@@ -55,7 +55,7 @@ static int __TCPMSS_parse(int c, char **argv, int invert, unsigned int *flags,
if (*flags)
exit_error(PARAMETER_PROBLEM,
"TCPMSS target: Only one option may be specified");
- if (string_to_number(optarg, 0, 65535 - hdrsize, &mssval) == -1)
+ if (string_to_number(optarg, 0, UINT16_MAX - hdrsize, &mssval) == -1)
exit_error(PARAMETER_PROBLEM, "Bad TCPMSS value `%s'", optarg);
mssinfo->mss = mssval;