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V4L/DVB (13953): firedtv: add missing NULL pointer check

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If there is ever going to be a FireDTV or FloppyDTV firmware which does
not provide a minimal ASCII textual descriptor for Model_Id --- or if
the descriptor is provided indirectly in a descriptor directory ---
the ieee1394 variant of the device probe of firedtv would dereference a
NULL pointer.  The firewire variant of firedtv's device probe is not
affected.

The fix makes sure that such an unexpected firmware is safely recognized
by fdtv_alloc as an unknown firmware.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Stefan Richter 2009-12-25 21:47:12 -03:00 committed by Mauro Carvalho Chehab
parent f0ecba96e7
commit b2ad41f9ef
1 changed files with 7 additions and 3 deletions
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10
drivers/media/dvb/firewire/firedtv-1394.c
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@ -192,9 +192,13 @@ static int node_probe(struct device *dev)
int kv_len, err;
void *kv_str;
kv_len = (ud->model_name_kv->value.leaf.len - 2) * sizeof(quadlet_t);
kv_str = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(ud->model_name_kv);
if (ud->model_name_kv) {
kv_len = (ud->model_name_kv->value.leaf.len - 2) * 4;
kv_str = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(ud->model_name_kv);
} else {
kv_len = 0;
kv_str = NULL;
}
fdtv = fdtv_alloc(dev, &fdtv_1394_backend, kv_str, kv_len);
if (!fdtv)
return -ENOMEM;