s390/cio: fix a memleak in css_alloc_subchannel

commit 63e8b94ad1840f02462633abdb363397f56bc642 upstream.

When dma_set_coherent_mask() fails, sch->lock has not been
freed, which is allocated in css_sch_create_locks(), leading
to a memleak.

Fixes: 4520a91a976e ("s390/cio: use dma helpers for setting masks")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Message-Id: <20230921071412.13806-1-dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/linux-s390/bd38baa8-7b9d-4d89-9422-7e943d626d6e@linux.ibm.com/
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index c7db953..98a14c1 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -233,17 +233,19 @@ struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
         */
        ret = dma_set_coherent_mask(&sch->dev, DMA_BIT_MASK(31));
        if (ret)
-               goto err;
+               goto err_lock;
        /*
         * But we don't have such restrictions imposed on the stuff that
         * is handled by the streaming API.
         */
        ret = dma_set_mask(&sch->dev, DMA_BIT_MASK(64));
        if (ret)
-               goto err;
+               goto err_lock;
 
        return sch;
 
+err_lock:
+       kfree(sch->lock);
 err:
        kfree(sch);
        return ERR_PTR(ret);