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Subject[PATCH] misc: mic: scif: fix double free of scif_dev
Date
_scif_init() free scif_dev in the free_sdev erro path,
but _scif_exit will free it again when module exit, it
cause BUG_ON issue,

kernel BUG at mm/slub.c:3944!
invalid opcode: 0000 [#1] SMP KASAN PTI

Set scif_dev to NULL in scif_destroy_scifdev() to fix it.

Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
drivers/misc/mic/scif/scif_main.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/misc/mic/scif/scif_main.c b/drivers/misc/mic/scif/scif_main.c
index 36d847af1209..7f9ce0fe1e24 100644
--- a/drivers/misc/mic/scif/scif_main.c
+++ b/drivers/misc/mic/scif/scif_main.c
@@ -142,6 +142,7 @@ static int scif_setup_scifdev(void)
static void scif_destroy_scifdev(void)
{
kfree(scif_dev);
+ scif_dev = NULL;
}

static int scif_probe(struct scif_hw_dev *sdev)
--
2.20.1
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