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lseek: fix check for vattr.va_size overflow. Check suggested by bde simple not

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works with unsigned types.
This commit is contained in:
Andrey A. Chernov 2001-08-23 17:01:25 +00:00
parent e02faad5ca
commit db106eff39
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=82207
2 changed files with 4 additions and 2 deletions
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3
sys/kern/vfs_extattr.c
View File

@ -1640,9 +1640,10 @@ lseek(p, uap)
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error)
return (error);
/* 'vattr.va_size' is always >= 0 */
if (noneg &&
((offset > 0 && vattr.va_size > OFF_MAX - offset) ||
(offset < 0 && vattr.va_size < OFF_MIN - offset)))
(offset < 0 && vattr.va_size + offset > OFF_MAX)))
return (EOVERFLOW);
offset += vattr.va_size;
break;

3
sys/kern/vfs_syscalls.c
View File

@ -1640,9 +1640,10 @@ lseek(p, uap)
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error)
return (error);
/* 'vattr.va_size' is always >= 0 */
if (noneg &&
((offset > 0 && vattr.va_size > OFF_MAX - offset) ||
(offset < 0 && vattr.va_size < OFF_MIN - offset)))
(offset < 0 && vattr.va_size + offset > OFF_MAX)))
return (EOVERFLOW);
offset += vattr.va_size;
break;