From: Ernesto A. Fernández <ernesto.mnd.fernandez@xxxxxxxxx> Subject: hfs: prevent crash on exit from failed search hfs_find_exit() expects fd->bnode to be NULL after a search has failed. hfs_brec_insert() may instead set it to an error-valued pointer. Fix this to prevent a crash. Link: http://lkml.kernel.org/r/53d9749a029c41b4016c495fc5838c9dba3afc52.1530294815.git.ernesto.mnd.fernandez@xxxxxxxxx Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@xxxxxxxxx> Cc: Anatoly Trosinenko <anatoly.trosinenko@xxxxxxxxx> Cc: Viacheslav Dubeyko <slava@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/hfs/brec.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/fs/hfs/brec.c~hfs-prevent-crash-on-exit-from-failed-search +++ a/fs/hfs/brec.c @@ -75,9 +75,10 @@ int hfs_brec_insert(struct hfs_find_data if (!fd->bnode) { if (!tree->root) hfs_btree_inc_height(tree); - fd->bnode = hfs_bnode_find(tree, tree->leaf_head); - if (IS_ERR(fd->bnode)) - return PTR_ERR(fd->bnode); + node = hfs_bnode_find(tree, tree->leaf_head); + if (IS_ERR(node)) + return PTR_ERR(node); + fd->bnode = node; fd->record = -1; } new_node = NULL; _
