staging: most: avoid null pointer dereference when iface is null

In the case where the pointer iface is null then the reporting of this
error will dereference iface when printing an error message causing which
is not ideal.  Since the majority of callers to most_register_interface
report an error when -EINVAL is returned a simple fix is to just remove
the error message, I doubt it will be missed.

Addresses-Coverity: ("Dereference after null check")
Fixes: 57562a72414c ("Staging: most: add MOST driver's core module")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200624163957.11676-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/most/core.c b/drivers/most/core.c
index f781c46cd4af9afc2458a1fe0d53c95bbbb8abfb..353ab277cbc6bc0c05b49c5a9c32d595690085b8 100644 (file)
--- a/drivers/most/core.c
+++ b/drivers/most/core.c
@@ -1283,10 +1283,8 @@ int most_register_interface(struct most_interface *iface)
        struct most_channel *c;
 
        if (!iface || !iface->enqueue || !iface->configure ||
-           !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) {
-               dev_err(iface->dev, "Bad interface or channel overflow\n");
+           !iface->poison_channel || (iface->num_channels > MAX_CHANNELS))
                return -EINVAL;
-       }
 
        id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
        if (id < 0) {