The patch below does not apply to the 5.3-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 138e1a0990e80db486ab9f6c06bd5c01f9a97999 Mon Sep 17 00:00:00 2001 From: Gao Xiang <gaoxiang25@xxxxxxxxxx> Date: Mon, 19 Aug 2019 18:34:23 +0800 Subject: [PATCH] staging: erofs: add two missing erofs_workgroup_put for corrupted images 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@xxxxxxxxxxxxxxx> # 4.19+ Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx> Link: https://lore.kernel.org/r/20190819103426.87579-4-gaoxiang25@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> diff --git a/drivers/staging/erofs/zdata.c b/drivers/staging/erofs/zdata.c index 87b0c96caf8f..23283c97fd3b 100644 --- a/drivers/staging/erofs/zdata.c +++ b/drivers/staging/erofs/zdata.c @@ -357,14 +357,16 @@ static struct z_erofs_collection *cllookup(struct z_erofs_collector *clt, cl = z_erofs_primarycollection(pcl); if (unlikely(cl->pageofs != (map->m_la & ~PAGE_MASK))) { DBG_BUGON(1); - return ERR_PTR(-EIO); + erofs_workgroup_put(grp); + return ERR_PTR(-EFSCORRUPTED); } length = READ_ONCE(pcl->length); if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { DBG_BUGON(1); - return ERR_PTR(-EIO); + erofs_workgroup_put(grp); + return ERR_PTR(-EFSCORRUPTED); } } else { unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT;