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| author | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-12-06 17:34:19 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-12-07 13:29:58 +0300 |
| commit | a2ab06d7c4d6bfd0b545a768247a70463e977e27 (patch) | |
| tree | b67e6d3f3881678ce67d6139b626ffb3627e70b2 /drivers/media | |
| parent | 61b738e938ef091e0c4c4e8eadeaf27502732e97 (diff) | |
| download | linux-a2ab06d7c4d6bfd0b545a768247a70463e977e27.tar.xz | |
media: m920x: don't use stack on USB reads
Using stack-allocated pointers for USB message data don't work.
This driver is almost OK with that, except for the I2C read
logic.
Fix it by using a temporary read buffer, just like on all other
calls to m920x_read().
Link: https://lore.kernel.org/all/ccc99e48-de4f-045e-0fe4-61e3118e3f74@mida.se/
Reported-by: rkardell@mida.se
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/dvb-usb/m920x.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/media/usb/dvb-usb/m920x.c b/drivers/media/usb/dvb-usb/m920x.c index 4bb5b82599a7..691e05833db1 100644 --- a/drivers/media/usb/dvb-usb/m920x.c +++ b/drivers/media/usb/dvb-usb/m920x.c @@ -274,6 +274,13 @@ static int m920x_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int nu /* Should check for ack here, if we knew how. */ } if (msg[i].flags & I2C_M_RD) { + char *read = kmalloc(1, GFP_KERNEL); + if (!read) { + ret = -ENOMEM; + kfree(read); + goto unlock; + } + for (j = 0; j < msg[i].len; j++) { /* Last byte of transaction? * Send STOP, otherwise send ACK. */ @@ -281,9 +288,12 @@ static int m920x_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int nu if ((ret = m920x_read(d->udev, M9206_I2C, 0x0, 0x20 | stop, - &msg[i].buf[j], 1)) != 0) + read, 1)) != 0) goto unlock; + msg[i].buf[j] = read[0]; } + + kfree(read); } else { for (j = 0; j < msg[i].len; j++) { /* Last byte of transaction? Then send STOP. */ |