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[2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34abe3daf33sm74879a91.10.2025.12.11.15.55.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Dec 2025 15:55:22 -0800 (PST) Message-ID: <123e2014-59e0-4c0a-905f-c2fee4455eb8@suse.com> Date: Fri, 12 Dec 2025 10:25:17 +1030 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] btrfs: fix memory leak of fs_devices in degraded seed device path To: Deepanshu Kartikey , clm@fb.com, dsterba@suse.com, miaox@cn.fujitsu.com Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+eadd98df8bceb15d7fed@syzkaller.appspotmail.com References: <20251210132807.3263207-1-kartikey406@gmail.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: <20251210132807.3263207-1-kartikey406@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2025/12/10 23:58, Deepanshu Kartikey 写道: > In open_seed_devices(), when find_fsid() fails and we're in DEGRADED > mode, a new fs_devices is allocated via alloc_fs_devices() but is never > added to the seed_list before returning. This contrasts with the normal > path where fs_devices is properly added via list_add(). > > If any error occurs later in read_one_dev() or btrfs_read_chunk_tree(), > the cleanup code iterates seed_list to free seed devices, but this > orphaned fs_devices is never found and never freed, causing a memory > leak. Any devices allocated via add_missing_dev() and attached to this > fs_devices are also leaked. > > Fix this by adding the newly allocated fs_devices to seed_list in the > degraded path, consistent with the normal path. > > Fixes: 5f37583569442 ("Btrfs: move the missing device to its own fs device list") > Reported-by: syzbot+eadd98df8bceb15d7fed@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=eadd98df8bceb15d7fed > Tested-by: syzbot+eadd98df8bceb15d7fed@syzkaller.appspotmail.com > Signed-off-by: Deepanshu Kartikey Reviewed-by: Qu Wenruo Thanks, Qu > --- > fs/btrfs/volumes.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c > index ae1742a35e76..13c514684cfb 100644 > --- a/fs/btrfs/volumes.c > +++ b/fs/btrfs/volumes.c > @@ -7128,6 +7128,7 @@ static struct btrfs_fs_devices *open_seed_devices(struct btrfs_fs_info *fs_info, > > fs_devices->seeding = true; > fs_devices->opened = 1; > + list_add(&fs_devices->seed_list, &fs_info->fs_devices->seed_list); > return fs_devices; > } >