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Catch some cases where asking for ridiculously large allocations could

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result in a segfault.  Instead just return NULL.
This commit is contained in:
Poul-Henning Kamp 2003-01-30 15:00:17 +00:00
parent 271aee47ec
commit 7656b3500d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=110103
1 changed files with 4 additions and 0 deletions
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4
lib/libc/stdlib/malloc.c
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@ -326,6 +326,8 @@ map_pages(size_t pages)
result = (caddr_t)pageround((u_long)sbrk(0));
tail = result + (pages << malloc_pageshift);
if (tail < result)
return 0;
if (brk(tail)) {
#ifdef EXTRA_SANITY
@ -745,6 +747,8 @@ imalloc(size_t size)
if ((size + malloc_pagesize) < size) /* Check for overflow */
result = 0;
else if ((size + malloc_pagesize) >= (uintptr_t)page_dir)
result = 0;
else if (size <= malloc_maxsize)
result = malloc_bytes(size);
else