[merged mm-stable] mm-zsmalloc-do-not-attempt-to-free-is_err-handle.patch removed from -mm tree

[merged mm-stable] mm-zsmalloc-do-not-attempt-to-free-is_err-handle.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/zsmalloc: do not attempt to free IS_ERR handle
has been removed from the -mm tree.  Its filename was
     mm-zsmalloc-do-not-attempt-to-free-is_err-handle.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: mm/zsmalloc: do not attempt to free IS_ERR handle
Date: Tue, 16 Aug 2022 14:09:06 +0900

zsmalloc() now returns ERR_PTR values as handles, which zram accidentally
can pass to zs_free().  Another bad scenario is when zcomp_compress()
fails - handle has default -ENOMEM value, and zs_free() will try to free
that "pointer value".

Add the missing check and make sure that zs_free() bails out when
ERR_PTR() is passed to it.

Link: https://lkml.kernel.org/r/20220816050906.2583956-1-senozhatsky@chromium.org
Fixes: c7e6f17b52e9 ("zsmalloc: zs_malloc: return ERR_PTR on failure")
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>,
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zsmalloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/zsmalloc.c~mm-zsmalloc-do-not-attempt-to-free-is_err-handle
+++ a/mm/zsmalloc.c
@@ -1487,7 +1487,7 @@ void zs_free(struct zs_pool *pool, unsig
 	struct size_class *class;
 	enum fullness_group fullness;
 
-	if (unlikely(!handle))
+	if (IS_ERR_OR_NULL((void *)handle))
 		return;
 
 	/*
_

Patches currently in -mm which might be from senozhatsky@chromium.org are

block-zram-do-not-keep-dangling-zcomp-pointer-after-zram-reset.patch