linux-kernel - Re: [PATCH 4.19 41/88] net: ethernet: mlx4: Fix memory allocation in mlx4_buddy

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Date:   Tue, 8 Sep 2020 21:53:11 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Shung-Hsi Yu <shung-hsi.yu@...e.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 41/88] net: ethernet: mlx4: Fix memory allocation in
 mlx4_buddy_init()

Hi!

> On machines with much memory (> 2 TByte) and log_mtts_per_seg == 0, a
> max_order of 31 will be passed to mlx_buddy_init(), which results in
> s = BITS_TO_LONGS(1 << 31) becoming a negative value, leading to
> kvmalloc_array() failure when it is converted to size_t.
> 
>   mlx4_core 0000:b1:00.0: Failed to initialize memory region table, aborting
>   mlx4_core: probe of 0000:b1:00.0 failed with error -12
> 
> Fix this issue by changing the left shifting operand from a signed literal to
> an unsigned one.

Will we still have problems with > 4 TByte machines? Should the
computation be done in u64?

Best regards,
									Pavel

> Fixes: 225c7b1feef1 ("IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters")
> Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@...e.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

> +++ b/drivers/net/ethernet/mellanox/mlx4/mr.c
> @@ -114,7 +114,7 @@ static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
>  		goto err_out;
>  
>  	for (i = 0; i <= buddy->max_order; ++i) {
> -		s = BITS_TO_LONGS(1 << (buddy->max_order - i));
> +		s = BITS_TO_LONGS(1UL << (buddy->max_order - i));
>  		buddy->bits[i] = kvmalloc_array(s, sizeof(long), GFP_KERNEL | __GFP_ZERO);
>  		if (!buddy->bits[i])
>  			goto err_out_free;

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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