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| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-02-15 13:56:26 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-02-16 09:29:13 -0200 |
| commit | 21cf734c79e6c741dcdf383dbaef3b551b931568 (patch) | |
| tree | baa32506b34ec592c9b17f0eab10a8e1cb74dce8 /drivers/media/common | |
| parent | 8c755c29108f00c354e3dfa24a2a546be566f604 (diff) | |
| download | linux-21cf734c79e6c741dcdf383dbaef3b551b931568.tar.bz2 | |
[media] siano: firmware buffer is too small
As pointed by KASAN:
BUG: KASAN: slab-out-of-bounds in memcpy+0x1d/0x40 at addr ffff880000038d8c
Read of size 128 by task systemd-udevd/2536
page:ffffea0000000800 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
flags: 0xffff8000004000(head)
page dumped because: kasan: bad access detected
CPU: 1 PID: 2536 Comm: systemd-udevd Not tainted 4.5.0-rc3+ #47
Hardware name: /NUC5i7RYB, BIOS RYBDWi35.86A.0350.2015.0812.1722 08/12/2015
ffff880000038d8c ffff8803b0f1f1e8 ffffffff81933901 0000000000000080
ffff8803b0f1f280 ffff8803b0f1f270 ffffffff815602c5 ffffffff8284cf93
ffffffff822ddc00 0000000000000282 0000000000000001 ffff88009c7c6000
Call Trace:
[<ffffffff81933901>] dump_stack+0x85/0xc4
[<ffffffff815602c5>] kasan_report_error+0x525/0x550
[<ffffffff815606e9>] kasan_report+0x39/0x40
[<ffffffff8155f84d>] memcpy+0x1d/0x40
[<ffffffffa120cb90>] smscore_set_device_mode+0xee0/0x2560 [smsmdtv]
Such error happens at the memcpy code below:
0x4bc0 is in smscore_set_device_mode (drivers/media/common/siano/smscoreapi.c:975).
970 sizeof(u32) + payload_size));
971
972 data_msg->mem_addr = mem_address;
973 memcpy(data_msg->payload, payload, payload_size);
974
975 rc = smscore_sendrequest_and_wait(coredev, data_msg,
976 data_msg->x_msg_header.msg_length,
977 &coredev->data_download_done);
978
979 payload += payload_size;
The problem is that the Siano driver uses a header to store the firmware,
with requires a few more bytes than allocated.
Tested with:
PCTV 77e (2013:0257)
Hauppauge WinTV MiniStick (2040:5510)
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/common')
| -rw-r--r-- | drivers/media/common/siano/smscoreapi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/common/siano/smscoreapi.c b/drivers/media/common/siano/smscoreapi.c index 2a8d9a36d6f0..f3a42834d7d6 100644 --- a/drivers/media/common/siano/smscoreapi.c +++ b/drivers/media/common/siano/smscoreapi.c @@ -1167,8 +1167,8 @@ static int smscore_load_firmware_from_file(struct smscore_device_t *coredev, return rc; } pr_debug("read fw %s, buffer size=0x%zx\n", fw_filename, fw->size); - fw_buf = kmalloc(ALIGN(fw->size, SMS_ALLOC_ALIGNMENT), - GFP_KERNEL | GFP_DMA); + fw_buf = kmalloc(ALIGN(fw->size + sizeof(struct sms_firmware), + SMS_ALLOC_ALIGNMENT), GFP_KERNEL | GFP_DMA); if (!fw_buf) { pr_err("failed to allocate firmware buffer\n"); rc = -ENOMEM; |