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tcp: fix sequence number comparison

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This fixes both undefined behavior (see bug #51447) as well as a possible bug
where sequence numbers in 31 bit distance may come through.
This commit is contained in:
Simon Goldschmidt 2020-03-27 22:59:05 +01:00
parent e30d50710d
commit 003d34eebd
1 changed files with 4 additions and 7 deletions
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11
src/include/lwip/priv/tcp_priv.h
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@ -106,14 +106,11 @@ err_t tcp_process_refused_data(struct tcp_pcb *pcb);
#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
#define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
#define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
#define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
#define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
#define TCP_SEQ_LT(a,b) (((u32_t)((u32_t)(a) - (u32_t)(b)) & 0x80000000u) != 0)
#define TCP_SEQ_LEQ(a,b) (!(TCP_SEQ_LT(b,a)))
#define TCP_SEQ_GT(a,b) TCP_SEQ_LT(b,a)
#define TCP_SEQ_GEQ(a,b) TCP_SEQ_LEQ(b,a)
/* is b<=a<=c? */
#if 0 /* see bug #10548 */
#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
#endif
#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
#ifndef TCP_TMR_INTERVAL