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Fix some bugs in the previous revision (1.419). Don't perform extra

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vfs_rel() on the mountpoint if the MAC checks fail in kern_statfs() and
kern_fstatfs().  Similarly, don't perform an extra vfs_rel() if we get
a doomed vnode in kern_fstatfs(), and handle the case of mp being NULL
(for some doomed vnodes) by conditionalizing the vfs_rel() in
kern_fstatfs() on mp != NULL.

CID:		1517
Found by:	Coverity Prevent (tm) (kern_fstatfs())
Pointy hat to:	jhb
This commit is contained in:
John Baldwin 2006-08-02 15:27:48 +00:00
parent dad9051355
commit 9802d04ce0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=160924
2 changed files with 8 additions and 18 deletions
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13
sys/kern/vfs_extattr.c
View File

@ -253,10 +253,8 @@ kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
vput(nd.ni_vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error) {
vfs_rel(mp);
if (error)
goto out;
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -335,17 +333,13 @@ kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
if (vp->v_iflag & VI_DOOMED) {
if (mp)
vfs_rel(mp);
error = EBADF;
goto out;
}
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error) {
vfs_rel(mp);
if (error)
goto out;
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -365,7 +359,8 @@ kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
}
*buf = *sp;
out:
vfs_rel(mp);
if (mp)
vfs_rel(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}

13
sys/kern/vfs_syscalls.c
View File

@ -253,10 +253,8 @@ kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
vput(nd.ni_vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error) {
vfs_rel(mp);
if (error)
goto out;
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -335,17 +333,13 @@ kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
if (vp->v_iflag & VI_DOOMED) {
if (mp)
vfs_rel(mp);
error = EBADF;
goto out;
}
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error) {
vfs_rel(mp);
if (error)
goto out;
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -365,7 +359,8 @@ kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
}
*buf = *sp;
out:
vfs_rel(mp);
if (mp)
vfs_rel(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}