patch "staging: erofs: add two missing erofs_workgroup_put for corrupted" added to staging-next

This is a note to let you know that I've just added the patch titled

staging: erofs: add two missing erofs_workgroup_put for corrupted

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

From 138e1a0990e80db486ab9f6c06bd5c01f9a97999 Mon Sep 17 00:00:00 2001
From: Gao Xiang <[email protected]>
Date: Mon, 19 Aug 2019 18:34:23 +0800
Subject: 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.

---
 drivers/staging/erofs/zdata.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

index 87b0c96caf8f..23283c97fd3b 100644
@@ -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;

2.23.0