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closefrom: clamp lowfd to >= 0; close_range's parameters are unsigned.

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Pointy hat:	kevans
Reported by:	CI (lwhsu)
This commit is contained in:
Kyle Evans 2020-04-14 23:24:24 +00:00
parent 9ac7c6cfed
commit 7851fb8ecb
1 changed files with 2 additions and 1 deletions
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3
lib/libc/sys/closefrom.c
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@ -28,6 +28,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/syscall.h>
#include <unistd.h>
@ -40,7 +41,7 @@ closefrom(int lowfd)
{
if (__getosreldate() >= CLOSE_RANGE_OSREL)
__sys_close_range(lowfd, ~0U, 0);
__sys_close_range(MAX(0, lowfd), ~0U, 0);
else
/* Fallback to closefrom(2) on older kernels. */
syscall(SYS_freebsd12_closefrom, lowfd);