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authorNaohiro Aota <naohiro.aota@wdc.com>2017-08-25 08:15:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-05 10:47:35 +0300
commit632ecb4ee6b3b129e1567296d730fc538e113fbf (patch)
treea1f07dbbb7bb41f90956a5664316e8a7a1280048 /fs/btrfs
parent8c64ccdccea9f9c3c7c7ae16dc0c94221ab50805 (diff)
downloadlinux-632ecb4ee6b3b129e1567296d730fc538e113fbf.tar.xz
btrfs: fix NULL pointer dereference from free_reloc_roots()
commit bb166d7207432d3c7d10c45dc052f12ba3a2121d upstream. __del_reloc_root should be called before freeing up reloc_root->node. If not, calling __del_reloc_root() dereference reloc_root->node, causing the system BUG. Fixes: 6bdf131fac23 ("Btrfs: don't leak reloc root nodes on error") Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/relocation.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 65661d1aae4e..6445de8e9ece 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2393,11 +2393,11 @@ void free_reloc_roots(struct list_head *list)
while (!list_empty(list)) {
reloc_root = list_entry(list->next, struct btrfs_root,
root_list);
+ __del_reloc_root(reloc_root);
free_extent_buffer(reloc_root->node);
free_extent_buffer(reloc_root->commit_root);
reloc_root->node = NULL;
reloc_root->commit_root = NULL;
- __del_reloc_root(reloc_root);
}
}