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fix issue with invalidating pointer to last procsub; fix boundary issues with small reallocs

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This commit is contained in:
Chet Ramey
2024-07-26 09:30:30 -04:00
parent 6c70309275
commit d5ef283cbd
8 changed files with 59 additions and 8 deletions
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lib/malloc/malloc.c
+2 -2
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@@ -274,7 +274,7 @@ typedef union _malloc_guard {
/* Use this when we want to be sure that NB is in bucket NU. */
#define RIGHT_BUCKET(nb, nu) \
(((nb) > binsizes[(nu)-1]) && ((nb) <= binsizes[(nu)]))
(((nb) > (((nu) >= 1) ? binsizes[(nu)-1] : 0UL)) && ((nb) <= binsizes[(nu)]))
/* nextf[i] is free list of blocks of size 2**(i + 5) */
@@ -1202,7 +1202,7 @@ internal_realloc (PTR_T mem, size_t n, const char *file, int line, int flags)
nbytes = ALLOCATED_BYTES(n);
/* If ok, use the same block, just marking its size as changed. */
if (RIGHT_BUCKET(nbytes, nunits) || RIGHT_BUCKET(nbytes, nunits-1))
if (RIGHT_BUCKET(nbytes, nunits) || (nunits >= 1 && RIGHT_BUCKET(nbytes, nunits-1)))
{
/* Compensate for increment above. */
m -= 4;