Patch "i2c: designware: Correct length byte validation logic" has been added to the 6.4-stable tree

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This is a note to let you know that I've just added the patch titled

    i2c: designware: Correct length byte validation logic

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-designware-correct-length-byte-validation-logic.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 49d4db3953cb9004ff94efc0c176e026c820af5a Mon Sep 17 00:00:00 2001
From: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 26 Jul 2023 15:00:00 +0700
Subject: i2c: designware: Correct length byte validation logic

From: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>

commit 49d4db3953cb9004ff94efc0c176e026c820af5a upstream.

Commit 0daede80f870 ("i2c: designware: Convert driver to using regmap API")
changes the logic to validate the whole 32-bit return value of
DW_IC_DATA_CMD register instead of 8-bit LSB without reason.

Later, commit f53f15ba5a85 ("i2c: designware: Get right data length"),
introduced partial fix but not enough because the "tmp > 0" still test
tmp as 32-bit value and is wrong in case the IC_DATA_CMD[11] is set.

Revert the logic to just before commit 0daede80f870
("i2c: designware: Convert driver to using regmap API").

Fixes: f53f15ba5a85 ("i2c: designware: Get right data length")
Fixes: 0daede80f870 ("i2c: designware: Convert driver to using regmap API")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Tam Nguyen <tamnguyenchi@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230726080001.337353-2-tamnguyenchi@xxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/i2c/busses/i2c-designware-master.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -526,9 +526,10 @@ i2c_dw_read(struct dw_i2c_dev *dev)
 			u32 flags = msgs[dev->msg_read_idx].flags;
 
 			regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
+			tmp &= DW_IC_DATA_CMD_DAT;
 			/* Ensure length byte is a valid value */
 			if (flags & I2C_M_RECV_LEN &&
-			    (tmp & DW_IC_DATA_CMD_DAT) <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
+			    tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
 				len = i2c_dw_recv_len(dev, tmp);
 			}
 			*buf++ = tmp;


Patches currently in stable-queue which might be from quan@xxxxxxxxxxxxxxxxxxxxxx are

queue-6.4/i2c-designware-correct-length-byte-validation-logic.patch



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