https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291677
Bug ID: 291677
Summary: FreeBSD 15.0 realloc does not set errno for large size
values
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Using the following test program:
```
$ cat main.c
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
errno = 1729;
void *p = malloc (1);
printf ("p = 0x%jx, errno = %d\n", (uintmax_t) p, errno);
p = realloc (p, PTRDIFF_MAX);
printf ("p = 0x%jx, errno = %d\n", (uintmax_t) p, errno);
}
```
Here is the output on FreeBSD 14.3:
```
$ uname -r && cc main.c && ./a.out
14.3-RELEASE-p5
p = 0x2bf54fe08008, errno = 1729
p = 0x0, errno = 12
```
Here is the output on FreeBSD 15.0:
```
$ uname -r && cc main.c && ./a.out
15.0-RELEASE
p = 0x1b6e8dc08000, errno = 1729
p = 0x0, errno = 1729
```
So for large size values on FreeBSD 15.0 `realloc` fails but does not set
`errno` to `ENOMEM` like FreeBSD 14.3.
This was found in the Gnulib test suite by Bruno Haible [1]. He wrote:
> The reason is that realloc (p, size) sets errno when failing only when
> size <= 0x700000000000000; it leaves errno untouched if
> size > 0x700000000000000.
[1] https://lists.gnu.org/archive/html/bug-gnulib/2025-12/msg00021.html
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