git: bbab525fc11b - stable/13 - msdosfs: handle inconsistently hashed denodes

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=bbab525fc11b7c71e92908d0c646944f36da60ec

commit bbab525fc11b7c71e92908d0c646944f36da60ec
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2021-12-23 23:21:53 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2022-01-14 18:11:01 +0000

    msdosfs: handle inconsistently hashed denodes
    
    (cherry picked from commit 595ed4d76713c1e9cab7d8a160ed59f8f4e5ecb4)
---
 sys/fs/msdosfs/msdosfs_denode.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/sys/fs/msdosfs/msdosfs_denode.c b/sys/fs/msdosfs/msdosfs_denode.c
index de73579c7d16..bdc7436079ea 100644
--- a/sys/fs/msdosfs/msdosfs_denode.c
+++ b/sys/fs/msdosfs/msdosfs_denode.c
@@ -142,9 +142,23 @@ deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
 		return (error);
 	if (nvp != NULL) {
 		*depp = VTODE(nvp);
-		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
-		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
+		if ((*depp)->de_dirclust != dirclust) {
+			printf("%s: wrong dir cluster %lu %lu\n",
+			    pmp->pm_mountp->mnt_stat.f_mntonname,
+			    (*depp)->de_dirclust, dirclust);
+			goto badoff;
+		}
+		if ((*depp)->de_diroffset != diroffset) {
+			printf("%s: wrong dir offset %lu %lu\n",
+			    pmp->pm_mountp->mnt_stat.f_mntonname,
+			    (*depp)->de_diroffset,  diroffset);
+			goto badoff;
+		}
 		return (0);
+badoff:
+		vgone(nvp);
+		vput(nvp);
+		return (EBADF);
 	}
 	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);