[PATCH][next] regmap-irq: Fix dereference of a potentially null d->virt_buf

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

The clean up of struct d can potentiallly index into a null array
d->virt_buf causing errorenous pointer dereferencing issues on
kfree calls.  Fix this by adding a null check on d->virt_buf before
attempting to traverse the array to kfree the objects.

Addresses-Coverity: ("Dereference after null check")
Fixes: 4c5014456305 ("regmap-irq: Introduce virtual regs to handle more config 
regs")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/base/regmap/regmap-irq.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index e6343ccc6aa1..760296a4b606 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -901,9 +901,11 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle 
*fwnode,
        kfree(d->mask_buf);
        kfree(d->status_buf);
        kfree(d->status_reg_buf);
-       for (i = 0; i < chip->num_virt_regs; i++)
-               kfree(d->virt_buf[i]);
-       kfree(d->virt_buf);
+       if (d->virt_buf) {
+               for (i = 0; i < chip->num_virt_regs; i++)
+                       kfree(d->virt_buf[i]);
+               kfree(d->virt_buf);
+       }
        kfree(d);
        return ret;
 }
-- 
2.30.2