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prevent allocs than PTRDIFF_MAX via mremap

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It's quite feasible for this to happen via MREMAP_MAYMOVE.
This commit is contained in:
Daniel Micay 2015-10-31 05:14:45 -04:00 committed by Rich Felker
parent 36e8b6a28b
commit f9ecb6bfa1
1 changed files with 8 additions and 1 deletions
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9
src/mman/mremap.c
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@ -1,5 +1,7 @@
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdint.h>
#include <stdarg.h>
#include "syscall.h"
#include "libc.h"
@ -8,7 +10,12 @@ void *__mremap(void *old_addr, size_t old_len, size_t new_len, int flags, ...)
{
va_list ap;
void *new_addr;
if (new_len >= PTRDIFF_MAX) {
errno = ENOMEM;
return MAP_FAILED;
}
va_start(ap, flags);
new_addr = va_arg(ap, void *);
va_end(ap);