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Change History

In the Linux kernel, the following vulnerability has been resolved:

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

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().

https://git.kernel.org/stable/c/3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270

https://git.kernel.org/stable/c/62ac2473553a00229e67bdf3cb023b62cf7f5a9a

https://git.kernel.org/stable/c/6402116a7b5ec80fa40fd145a80c813019cd555f

https://git.kernel.org/stable/c/66c8e816f2f2ca4a61b406503bd10bad1b35f72f

https://git.kernel.org/stable/c/91443c669d280937968f0aa4edefa741cfe35314