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[lwip-devel] [bug #51447] Sequence number comparisons invoke undefined b

From: Ambroz Bizjak
Subject: [lwip-devel] [bug #51447] Sequence number comparisons invoke undefined behavior
Date: Tue, 11 Jul 2017 18:26:13 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 
Follow-up Comment #1, bug #51447 (project lwip):

forgot to cast the diferences to u32... the right code is:

#define TCP_SEQ_LT(a,b) ((u32_t)((u32_t)(a) - (u32_t)(b)) >= 0x80000000u) 
#define TCP_SEQ_LT(a,b) (((u32_t)((u32_t)(a) - (u32_t)(b)) & 0x80000000u) !=
0) 
#define TCP_SEQ_LT(a,b) ((u32_t)((u32_t)(a) - (u32_t)(b)) >> 31) 

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  <http://savannah.nongnu.org/bugs/?51447>

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