From: Gao Xiang <hsiangkao@linux.alibaba.com>
Date: Fri, 26 May 2023 20:14:59 +0000 (+0800)
Subject: erofs: use poison pointer to replace the hard-coded address
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=43d86ec93630396b622acf3f9cb88f734d4098e8;p=linux.git

erofs: use poison pointer to replace the hard-coded address

It's safer and cleaner to replace such hard-coded illegal pointer
with poison pointers.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Link: https://lore.kernel.org/r/20230526201459.128169-7-hsiangkao@linux.alibaba.com
---

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 637a964ff110c..264bf553c2874 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -91,10 +91,8 @@ struct z_erofs_pcluster {
 	struct z_erofs_bvec compressed_bvecs[];
 };
 
-/* let's avoid the valid 32-bit kernel addresses */
-
 /* the end of a chain of pclusters */
-#define Z_EROFS_PCLUSTER_TAIL           ((void *)0x5F0ECAFE)
+#define Z_EROFS_PCLUSTER_TAIL           ((void *) 0x700 + POISON_POINTER_DELTA)
 #define Z_EROFS_PCLUSTER_NIL            (NULL)
 
 struct z_erofs_decompressqueue {