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PPP, magic: dot not assume LWIP_RAND will return 32 bits of randomness

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Do not assume LWIP_RAND will return 32 bits of randomness because it is
probably going to be defined to directly return the rand() value. For
example, LCP magic numbers are 32-bit random values.
This commit is contained in:
Sylvain Rochet 2020-10-27 21:48:21 +01:00
parent e239222775
commit 332119d7e0
1 changed files with 1 additions and 1 deletions
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src/netif/ppp/magic.c
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@ -254,7 +254,7 @@ void magic_randomize(void) {
*/
u32_t magic(void) {
#ifdef LWIP_RAND
return LWIP_RAND() + magic_randomseed;
return (LWIP_RAND() << 16) + LWIP_RAND() + magic_randomseed;
#else /* LWIP_RAND */
return ((u32_t)rand() << 16) + (u32_t)rand() + magic_randomseed;
#endif /* LWIP_RAND */