From: Gao Xiang gaoxiang25@huawei.com
commit 138e1a0990e80db486ab9f6c06bd5c01f9a97999 upstream.
As reported by erofs-utils fuzzer, these error handling path will be entered to handle corrupted images.
Lack of erofs_workgroup_puts will cause unmounting unsuccessfully.
Fix these return values to EFSCORRUPTED as well.
Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support") Cc: stable@vger.kernel.org # 4.19+ Signed-off-by: Gao Xiang gaoxiang25@huawei.com Reviewed-by: Chao Yu yuchao0@huawei.com Link: https://lore.kernel.org/r/20190819103426.87579-4-gaoxiang25@huawei.com [ Gao Xiang: Older kernel versions don't have length validity check and EFSCORRUPTED, thus backport pageofs check for now. ] Signed-off-by: Gao Xiang gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/erofs/unzip_vle.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -311,7 +311,11 @@ z_erofs_vle_work_lookup(struct super_blo /* if multiref is disabled, `primary' is always true */ primary = true;
- DBG_BUGON(work->pageofs != pageofs); + if (work->pageofs != pageofs) { + DBG_BUGON(1); + erofs_workgroup_put(egrp); + return ERR_PTR(-EIO); + }
/* * lock must be taken first to avoid grp->next == NIL between