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HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

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[ Upstream commit 62ac2473553a00229e67bdf3cb023b62cf7f5a9a ]

Smatch Warning:
drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy()
'&mcp->txbuf[5]' too small (59 vs 255)
drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf'
too small (34 vs 255)

The 'len' variable can take a value between 0-255 as it can come from
data->block[0] and it is user data. So add an bound check to prevent a
buffer overflow in memcpy().

Fixes: 67a95c21463d ("HID: mcp2221: add usb to i2c-smbus host bridge")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harshit Mogalapalli 2022-06-20 09:28:24 -07:00 committed by Greg Kroah-Hartman
parent eafb19c8fe
commit 91443c669d
1 changed files with 3 additions and 0 deletions
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3
drivers/hid/hid-mcp2221.c
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@ -385,6 +385,9 @@ static int mcp_smbus_write(struct mcp2221 *mcp, u16 addr,
data_len = 7;
break;
default:
if (len > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
memcpy(&mcp->txbuf[5], buf, len);
data_len = len + 5;
}