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tap_user: Fix potential bogus header len underflow #245

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Merged
LekKit merged 1 commit into from
Jul 13, 2026
+2 −2
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tap_user: Fix potential bogus header len underflow #245

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4 changes: 2 additions & 2 deletions src/devices/tap_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -757,8 +757,8 @@ static void handle_ipv4(tap_dev_t* tap, const uint8_t* buffer, size_t size)
// This is a fragmented frame
return;
}
if (unlikely(size < total_length)) {
// Encoded size exceeds frame size
if (unlikely(total_length < header_length || size < total_length)) {
// Bogus IP header length or encoded size exceeds frame size
return;
}

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