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Avoid undefined behavior in an cpuset.c

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Do not change the signedness bit with a left shift operation.
Switch to unsigned integer to prevent this.

cpuset.c:112:18, left shift of 1 by 31 places cannot be represented in type 'int'

Detected with micro-UBSan in the user mode.
This commit is contained in:
kamil 2018-07-26 00:13:19 +00:00
parent 21d1b523b3
commit 4581cca75c
1 changed files with 5 additions and 5 deletions
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10
common/lib/libc/sys/cpuset.c
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@ -1,4 +1,4 @@
/* $NetBSD: cpuset.c,v 1.19 2018/01/04 20:57:28 kamil Exp $ */
/* $NetBSD: cpuset.c,v 1.20 2018/07/26 00:13:19 kamil Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -32,7 +32,7 @@
#ifndef _STANDALONE
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: cpuset.c,v 1.19 2018/01/04 20:57:28 kamil Exp $");
__RCSID("$NetBSD: cpuset.c,v 1.20 2018/07/26 00:13:19 kamil Exp $");
#endif /* LIBC_SCCS and not lint */
#ifdef _LIBC
@ -97,7 +97,7 @@ _cpuset_isset(cpuid_t i, const cpuset_t *c)
errno = EINVAL;
return -1;
}
return ((1 << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0;
return ((1U << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0;
}
int
@ -109,7 +109,7 @@ _cpuset_set(cpuid_t i, cpuset_t *c)
errno = EINVAL;
return -1;
}
c->bits[j] |= 1 << (unsigned int)(i & CPUSET_MASK);
c->bits[j] |= 1U << (unsigned int)(i & CPUSET_MASK);
return 0;
}
@ -122,7 +122,7 @@ _cpuset_clr(cpuid_t i, cpuset_t *c)
errno = EINVAL;
return -1;
}
c->bits[j] &= ~(1 << (unsigned int)(i & CPUSET_MASK));
c->bits[j] &= ~(1U << (unsigned int)(i & CPUSET_MASK));
return 0;
}