Date: Tue, 3 Aug 2021 09:52:48 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 2a56a5c2c21a - stable/13 - fifofs: fifo vnode might be relocked before VOP_OPEN() is called Message-ID: <202108030952.1739qmDL081381@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=2a56a5c2c21a7bf1fc321a60fffbd8d59970633b commit 2a56a5c2c21a7bf1fc321a60fffbd8d59970633b Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2021-07-22 10:27:43 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2021-08-03 09:52:36 +0000 fifofs: fifo vnode might be relocked before VOP_OPEN() is called (cherry picked from commit 10db1896495b744aa5b039dd4ef1973b7a339379) --- sys/fs/fifofs/fifo_vnops.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c index d2a51de84fba..861f1b40a744 100644 --- a/sys/fs/fifofs/fifo_vnops.c +++ b/sys/fs/fifofs/fifo_vnops.c @@ -282,9 +282,21 @@ fifo_close(ap) struct pipe *cpipe; vp = ap->a_vp; + ASSERT_VOP_ELOCKED(vp, "fifo_close"); fip = vp->v_fifoinfo; + + /* + * During open, it is possible that the fifo vnode is relocked + * after the vnode is instantiated but before VOP_OPEN() is + * done. For instance, vn_open_vnode() might need to upgrade + * vnode lock, or ffs_vput_pair() needs to unlock vp to sync + * dvp. In this case, reclaim can observe us with v_fifoinfo + * equal to NULL. + */ + if (fip == NULL) + return (0); + cpipe = fip->fi_pipe; - ASSERT_VOP_ELOCKED(vp, "fifo_close"); if (ap->a_fflag & FREAD) { fip->fi_readers--; if (fip->fi_readers == 0) {
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