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Input: rmi4 - fix type overflow in register counts

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The number of registers in the RMI4 register descriptor is populated
by counting the bits in the presence map using bitmap_weight(). Since
the presence map can contain up to 256 bits (RMI_REG_DESC_PRESENSE_BITS),
storing this count in a u8 can overflow to 0 if all 256 bits are set.

Change the num_registers field in struct rmi_register_descriptor
from u8 to u16 to prevent potential integer overflow and ensure safe
processing of devices reporting large descriptors.

Fixes: 2b6a321da9 ("Input: synaptics-rmi4 - add support for Synaptics RMI4 devices")
Cc: stable@vger.kernel.org
Assisted-by: Gemini:gemini-3.1-pro
Link: https://patch.msgid.link/20260505045952.1570713-3-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2026-05-04 21:59:33 -07:00
parent 0adb483fbf
commit a0a87e4412
1 changed files with 1 additions and 1 deletions
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2
drivers/input/rmi4/rmi_driver.h
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@ -65,7 +65,7 @@ struct rmi_register_desc_item {
struct rmi_register_descriptor {
unsigned long struct_size;
unsigned long presense_map[BITS_TO_LONGS(RMI_REG_DESC_PRESENSE_BITS)];
u8 num_registers;
u16 num_registers;
struct rmi_register_desc_item *registers;
};