media: c8sectpfe: fix double free in configure_channels()

The configure_channels() function has a double free because
configure_memdma_and_inputblock() calls free_input_block() and then
it's called again in the error handling code.

Link: https://lore.kernel.org/linux-media/20211208073544.GA22020@kili
Fixes: c5f5d0f99794 ("[media] c8sectpfe: STiH407/10 Linux DVB demux support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c b/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c
index e1f5209..7bb1384 100644 (file)
--- a/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c
+++ b/drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c
@@ -925,7 +925,6 @@ static int c8sectpfe_remove(struct platform_device *pdev)
 static int configure_channels(struct c8sectpfei *fei)
 {
        int index = 0, ret;
-       struct channel_info *tsin;
        struct device_node *child, *np = fei->dev->of_node;
 
        /* iterate round each tsin and configure memdma descriptor and IB hw */
@@ -943,10 +942,9 @@ static int configure_channels(struct c8sectpfei *fei)
        return 0;
 
 err_unmap:
-       for (index = 0; index < fei->tsin_count; index++) {
-               tsin = fei->channel_data[index];
-               free_input_block(fei, tsin);
-       }
+       while (--index >= 0)
+               free_input_block(fei, fei->channel_data[index]);
+
        return ret;
 }