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fixed bug #37166: memp_sanity check loops itself

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goldsimon 2012-08-22 21:59:02 +02:00
parent c762c06b17
commit 150b4fb4f6
2 changed files with 11 additions and 7 deletions
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3
CHANGELOG
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@ -80,6 +80,9 @@ HISTORY
++ Bugfixes: ++ Bugfixes:
2012-08-22: Simon Goldschmidt
* memp.c: fixed bug #37166: memp_sanity check loops itself
2012-08-13: Simon Goldschmidt 2012-08-13: Simon Goldschmidt
* dhcp.c: fixed bug #36645: Calling dhcp_release before dhcp_start * dhcp.c: fixed bug #36645: Calling dhcp_release before dhcp_start
dereferences NULL dereferences NULL

15
src/core/memp.c
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@ -179,19 +179,20 @@ static u8_t memp_memory[MEM_ALIGNMENT - 1
#if MEMP_SANITY_CHECK #if MEMP_SANITY_CHECK
/** /**
* Check that memp-lists don't form a circle * Check that memp-lists don't form a circle, using "Floyd's cycle-finding algorithm".
*/ */
static int static int
memp_sanity(void) memp_sanity(void)
{ {
s16_t i, c; s16_t i;
struct memp *m, *n; struct memp *t, *h;
for (i = 0; i < MEMP_MAX; i++) { for (i = 0; i < MEMP_MAX; i++) {
for (m = memp_tab[i]; m != NULL; m = m->next) { t = memp_tab[i];
c = 1; if(t != NULL) {
for (n = memp_tab[i]; n != NULL; n = n->next) { for (h = t->next; (t != NULL) && (h != NULL); t = t->next,
if (n == m && --c < 0) { h = (((h->next != NULL) && (h->next->next != NULL)) ? h->next->next : NULL)) {
if (t == h) {
return 0; return 0;
} }
} }