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Message-ID: <d997f776-2b20-f38c-1347-c8734cc4e467@linux.alibaba.com>
Date: Tue, 14 Nov 2023 15:41:01 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Jingbo Xu <jefflexu@...ux.alibaba.com>, xiang@...nel.org,
chao@...nel.org, linux-erofs@...ts.ozlabs.org
Cc: huyue2@...lpad.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] erofs: fix NULL dereference of dif->bdev_handle in
fscache mode
On 2023/11/14 15:07, Jingbo Xu wrote:
> Avoid NULL dereference of dif->bdev_handle, as dif->bdev_handle is NULL
> in fscache mode.
>
> BUG: kernel NULL pointer dereference, address: 0000000000000000
> RIP: 0010:erofs_map_dev+0xbd/0x1c0
> Call Trace:
> <TASK>
> erofs_fscache_data_read_slice+0xa7/0x340
> erofs_fscache_data_read+0x11/0x30
> erofs_fscache_readahead+0xd9/0x100
> read_pages+0x47/0x1f0
> page_cache_ra_order+0x1e5/0x270
> filemap_get_pages+0xf2/0x5f0
> filemap_read+0xb8/0x2e0
> vfs_read+0x18d/0x2b0
> ksys_read+0x53/0xd0
> do_syscall_64+0x42/0xf0
> entry_SYSCALL_64_after_hwframe+0x6e/0x76
>
> Reported-by: Yiqun Leng <yqleng@...ux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7245
> Fixes: 49845720080d ("erofs: Convert to use bdev_open_by_path()")
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Thanks,
Gao Xiang
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