git: c76461e064b6 - stable/12 - Fix a vnode locking bug in fuse_vnop_advlock.
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Date: Wed, 19 Oct 2022 03:04:38 UTC
The branch stable/12 has been updated by asomers: URL: https://cgit.FreeBSD.org/src/commit/?id=c76461e064b675c8edd3b1d9bb917905a885a860 commit c76461e064b675c8edd3b1d9bb917905a885a860 Author: Alan Somers <asomers@FreeBSD.org> AuthorDate: 2020-12-30 23:50:35 +0000 Commit: Alan Somers <asomers@FreeBSD.org> CommitDate: 2022-10-19 02:58:01 +0000 Fix a vnode locking bug in fuse_vnop_advlock. Must lock the vnode before accessing the fufh table. Also, check for invalid parameters earlier. Bug introduced by r346170. MFC after: 2 weeks Reviewed by: cem Differential Revision: https://reviews.freebsd.org/D27936 (cherry picked from commit 542711e52079f65647ac1daadf0c9e74cb221f3e) --- sys/fs/fuse/fuse_vnops.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c index d28c869e5248..311ea8a049ef 100644 --- a/sys/fs/fuse/fuse_vnops.c +++ b/sys/fs/fuse/fuse_vnops.c @@ -395,18 +395,6 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) return ENXIO; } - if (!(dataflags & FSESS_POSIX_LOCKS)) - return vop_stdadvlock(ap); - /* FUSE doesn't properly support flock until protocol 7.17 */ - if (flags & F_FLOCK) - return vop_stdadvlock(ap); - - err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid); - if (err) - return err; - - fdisp_init(&fdi, sizeof(*fli)); - switch(ap->a_op) { case F_GETLK: op = FUSE_GETLK; @@ -424,6 +412,20 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) return EINVAL; } + if (!(dataflags & FSESS_POSIX_LOCKS)) + return vop_stdadvlock(ap); + /* FUSE doesn't properly support flock until protocol 7.17 */ + if (flags & F_FLOCK) + return vop_stdadvlock(ap); + + vn_lock(vp, LK_SHARED | LK_RETRY); + + err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid); + if (err) + goto out; + + fdisp_init(&fdi, sizeof(*fli)); + fdisp_make_vp(&fdi, op, vp, td, cred); fli = fdi.indata; fli->fh = fufh->fh_id; @@ -453,6 +455,8 @@ fuse_vnop_advlock(struct vop_advlock_args *ap) } } +out: + VOP_UNLOCK(vp); return err; }