Patch "blk-throttle: check for overflow in calculate_bytes_allowed" has been added to the 6.5-stable tree

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

    blk-throttle: check for overflow in calculate_bytes_allowed

to the 6.5-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:
     blk-throttle-check-for-overflow-in-calculate_bytes_allowed.patch
and it can be found in the queue-6.5 subdirectory.

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


>From 2dd710d476f2f1f6eaca884f625f69ef4389ed40 Mon Sep 17 00:00:00 2001
From: Khazhismel Kumykov <khazhy@xxxxxxxxxxxx>
Date: Fri, 20 Oct 2023 15:36:17 -0700
Subject: blk-throttle: check for overflow in calculate_bytes_allowed

From: Khazhismel Kumykov <khazhy@xxxxxxxxxxxx>

commit 2dd710d476f2f1f6eaca884f625f69ef4389ed40 upstream.

Inexact, we may reject some not-overflowing values incorrectly, but
they'll be on the order of exabytes allowed anyways.

This fixes divide error crash on x86 if bps_limit is not configured or
is set too high in the rare case that jiffy_elapsed is greater than HZ.

Fixes: e8368b57c006 ("blk-throttle: use calculate_io/bytes_allowed() for throtl_trim_slice()")
Fixes: 8d6bbaada2e0 ("blk-throttle: prevent overflow while calculating wait time")
Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231020223617.2739774-1-khazhy@xxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 block/blk-throttle.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -723,6 +723,12 @@ static unsigned int calculate_io_allowed
 
 static u64 calculate_bytes_allowed(u64 bps_limit, unsigned long jiffy_elapsed)
 {
+	/*
+	 * Can result be wider than 64 bits?
+	 * We check against 62, not 64, due to ilog2 truncation.
+	 */
+	if (ilog2(bps_limit) + ilog2(jiffy_elapsed) - ilog2(HZ) > 62)
+		return U64_MAX;
 	return mul_u64_u64_div_u64(bps_limit, (u64)jiffy_elapsed, (u64)HZ);
 }
 


Patches currently in stable-queue which might be from khazhy@xxxxxxxxxxxx are

queue-6.5/blk-throttle-check-for-overflow-in-calculate_bytes_allowed.patch



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