media: firewire: Using uninitialized values in node_probe()

[ Upstream commit 2505a210fc126599013aec2be741df20aaacc490 ]

If fw_csr_string() returns -ENOENT, then "name" is uninitialized.  So
then the "strlen(model_names[i]) <= name_len" is true because strlen()
is unsigned and -ENOENT is type promoted to a very high positive value.
Then the "strncmp(name, model_names[i], name_len)" uses uninitialized
data because "name" is uninitialized.

Fixes: 92374e886c75 ("[media] firedtv: drop obsolete backend abstraction")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/firewire/firedtv-fw.c b/drivers/media/firewire/firedtv-fw.c
index 247f0e7cb5f7f6975857534a76f12aab2a53b005..5d634706a7eaac396254dff7cf43ce64041e053c 100644 (file)
--- a/drivers/media/firewire/firedtv-fw.c
+++ b/drivers/media/firewire/firedtv-fw.c
@@ -271,6 +271,8 @@ static int node_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
 
        name_len = fw_csr_string(unit->directory, CSR_MODEL,
                                 name, sizeof(name));
+       if (name_len < 0)
+               return name_len;
        for (i = ARRAY_SIZE(model_names); --i; )
                if (strlen(model_names[i]) <= name_len &&
                    strncmp(name, model_names[i], name_len) == 0)