mtd: rawnand: gpmi: Fix a double free in gpmi_nand_init

[ Upstream commit 076de75de1e53160e9b099f75872c1f9adf41a0b ]

If the callee gpmi_alloc_dma_buffer() failed to alloc memory for
this->raw_buffer, gpmi_free_dma_buffer() will be called to free
this->auxiliary_virt. But this->auxiliary_virt is still a non-NULL
and valid ptr.

Then gpmi_alloc_dma_buffer() returns err and gpmi_free_dma_buffer()
is called again to free this->auxiliary_virt in err_out. This causes
a double free.

As gpmi_free_dma_buffer() has already called in gpmi_alloc_dma_buffer's
error path, so it should return err directly instead of releasing the dma
buffer again.

Fixes: 4d02423e9afe6 ("mtd: nand: gpmi: Fix gpmi_nand_init() error path")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210403060905.5251-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index c7d0d2eed6c25d1366541cf6f6c1182a49ebfa4e..5a694bdc4f75a8dcd6e20436c85cd09b3d80dbcf 100644 (file)
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -2022,7 +2022,7 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
        this->bch_geometry.auxiliary_size = 128;
        ret = gpmi_alloc_dma_buffer(this);
        if (ret)
-               goto err_out;
+               return ret;
 
        ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL);
        if (ret)