media: saa7146: hexium_gemini: Fix a NULL pointer dereference in hexium_attach()

[ Upstream commit 3af86b046933ba513d08399dba0d4d8b50d607d0 ]

In hexium_attach(dev, info), saa7146_vv_init() is called to allocate
a new memory for dev->vv_data. saa7146_vv_release() will be called on
failure of saa7146_register_device(). There is a dereference of
dev->vv_data in saa7146_vv_release(), which could lead to a NULL
pointer dereference on failure of saa7146_vv_init().

Fix this bug by adding a check of saa7146_vv_init().

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_VIDEO_HEXIUM_GEMINI=m show no new warnings,
and our static analyzer no longer warns about this code.

Link: https://lore.kernel.org/linux-media/20211203154030.111210-1-zhou1615@umn.edu
Signed-off-by: Zhou Qingyang <zhou1615@umn.edu>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/common/saa7146/saa7146_fops.c b/drivers/media/common/saa7146/saa7146_fops.c
index df1e8c975cd82d97b6b5d9bb4edf0e2db7f006bd..6d0a0b08853b408b5a92268cabaefcfb955ad789 100644 (file)
--- a/drivers/media/common/saa7146/saa7146_fops.c
+++ b/drivers/media/common/saa7146/saa7146_fops.c
@@ -524,7 +524,7 @@ int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
                ERR("out of memory. aborting.\n");
                kfree(vv);
                v4l2_ctrl_handler_free(hdl);
-               return -1;
+               return -ENOMEM;
        }
 
        saa7146_video_uops.init(dev,vv);

diff --git a/drivers/media/pci/saa7146/hexium_gemini.c b/drivers/media/pci/saa7146/hexium_gemini.c
index 343cd75fcd8d19db09638a637c05c9768b4ef4fe..f09f311a316f584baa30d9b2e3a7451df03c42d2 100644 (file)
--- a/drivers/media/pci/saa7146/hexium_gemini.c
+++ b/drivers/media/pci/saa7146/hexium_gemini.c
@@ -296,7 +296,12 @@ static int hexium_attach(struct saa7146_dev *dev, struct saa7146_pci_extension_d
        hexium_set_input(hexium, 0);
        hexium->cur_input = 0;
 
-       saa7146_vv_init(dev, &vv_data);
+       ret = saa7146_vv_init(dev, &vv_data);
+       if (ret) {
+               i2c_del_adapter(&hexium->i2c_adapter);
+               kfree(hexium);
+               return ret;
+       }
 
        vv_data.vid_ops.vidioc_enum_input = vidioc_enum_input;
        vv_data.vid_ops.vidioc_g_input = vidioc_g_input;