The patch below does not apply to the 6.6-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@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 684826f8271ad97580b138b9ffd462005e470b99 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024100724-used-ventricle-7559@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

684826f8271a ("zram: free secondary algorithms names") f2bac7ad187d ("zram: introduce zcomp_params structure") 1d3100cf148d ("zram: add 842 compression backend support") 84112e314f69 ("zram: add zlib compression backend support") dbf2763cec21 ("zram: pass estimated src size hint to zstd") 73e7d81abbc8 ("zram: add zstd compression backend support") c60a4ef54446 ("zram: add lz4hc compression backend support") 22d651c3b339 ("zram: add lz4 compression backend support") 2152247c55b6 ("zram: add lzo and lzorle compression backends support") 917a59e81c34 ("zram: introduce custom comp backends API") 04cb7502a5d7 ("zsmalloc: use all available 24 bits of page_type") 43d746dc49bb ("mm/zsmalloc: use a proper page type") 8db00ad56461 ("mm: allow reuse of the lower 16 bit of the page type with an actual type") 6d21dde7adc0 ("mm: update _mapcount and page_type documentation") ff202303c398 ("mm: convert page type macros to enum") 46df8e73a4a3 ("mm: free up PG_slab") d99e3140a4d3 ("mm: turn folio_test_hugetlb into a PageType") fd1a745ce03e ("mm: support page_mapcount() on page_has_type() pages") 29cfe7556bfd ("mm: constify more page/folio tests") 443cbaf9e2fd ("crash: split vmcoreinfo exporting code out from crash_core.c")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 684826f8271ad97580b138b9ffd462005e470b99 Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky senozhatsky@chromium.org Date: Wed, 11 Sep 2024 11:54:56 +0900 Subject: [PATCH] zram: free secondary algorithms names

We need to kfree() secondary algorithms names when reset zram device that had multi-streams, otherwise we leak memory.

[senozhatsky@chromium.org: kfree(NULL) is legal] Link: https://lkml.kernel.org/r/20240917013021.868769-1-senozhatsky@chromium.org Link: https://lkml.kernel.org/r/20240911025600.3681789-1-senozhatsky@chromium.org Fixes: 001d92735701 ("zram: add recompression algorithm sysfs knob") Signed-off-by: Sergey Senozhatsky senozhatsky@chromium.org Cc: Minchan Kim minchan@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 1f1bf175a6c3..0207a7fc0a97 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -2112,6 +2112,11 @@ static void zram_destroy_comps(struct zram *zram) zram->num_active_comps--; }

+ for (prio = ZRAM_SECONDARY_COMP; prio < ZRAM_MAX_COMPS; prio++) { + kfree(zram->comp_algs[prio]); + zram->comp_algs[prio] = NULL; + } + zram_comp_params_reset(zram); }