svn commit: r345272 - stable/12/sys/fs/ext2fs
Fedor Uporov
fsu at FreeBSD.org
Mon Mar 18 12:34:15 UTC 2019
Author: fsu
Date: Mon Mar 18 12:34:13 2019
New Revision: 345272
URL: https://svnweb.freebsd.org/changeset/base/345272
Log:
MFC: r344757:
Fix double free in case of mount error.
Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as: FS-9-EXT3-2: Denial Of Service in nmount-5 (vm_fault_hold)
Reviewed by: pfg
Differential Revision: https://reviews.freebsd.org/D19385
Modified:
stable/12/sys/fs/ext2fs/ext2_vfsops.c
Modified: stable/12/sys/fs/ext2fs/ext2_vfsops.c
==============================================================================
--- stable/12/sys/fs/ext2fs/ext2_vfsops.c Mon Mar 18 12:31:07 2019 (r345271)
+++ stable/12/sys/fs/ext2fs/ext2_vfsops.c Mon Mar 18 12:34:13 2019 (r345272)
@@ -614,8 +614,12 @@ ext2_compute_sb_data(struct vnode *devvp, struct ext2f
fsbtodb(fs, ext2_cg_location(fs, i)),
fs->e2fs_bsize, NOCRED, &bp);
if (error) {
- free(fs->e2fs_contigdirs, M_EXT2MNT);
- free(fs->e2fs_gd, M_EXT2MNT);
+ /*
+ * fs->e2fs_gd and fs->e2fs_contigdirs
+ * will be freed later by the caller,
+ * because this function could be called from
+ * MNT_UPDATE path.
+ */
brelse(bp);
return (error);
}
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