6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sergey Senozhatsky senozhatsky@chromium.org
[ Upstream commit 684826f8271ad97580b138b9ffd462005e470b99 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/block/zram/zram_drv.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 06673c6ca2555..db729035fd6bf 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1983,6 +1983,11 @@ static void zram_destroy_comps(struct zram *zram) zcomp_destroy(comp); zram->num_active_comps--; } + + for (prio = ZRAM_SECONDARY_COMP; prio < ZRAM_MAX_COMPS; prio++) { + kfree(zram->comp_algs[prio]); + zram->comp_algs[prio] = NULL; + } }
static void zram_reset_device(struct zram *zram)