CVE-2021-47007

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Source
https://cve.org/CVERecord?id=CVE-2021-47007
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47007.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47007
Downstream
Published
2024-02-28T09:15:38.507Z
Modified
2026-03-15T14:45:39.261347Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix panic during f2fsresizefs()

f2fsresizefs() hangs in below callstack with testcase: - mkfs 16GB image & mount image - dd 8GB fileA - dd 8GB fileB - sync - rm fileA - sync - resize filesystem to 8GB

kernel BUG at segment.c:2484! Call Trace: allocatesegmentbydefault+0x92/0xf0 [f2fs] f2fsallocatedatablock+0x44b/0x7e0 [f2fs] dowritepage+0x5a/0x110 [f2fs] f2fsoutplacewritedata+0x55/0x100 [f2fs] f2fsdowritedatapage+0x392/0x850 [f2fs] movedatapage+0x233/0x320 [f2fs] dogarbagecollect+0x14d9/0x1660 [f2fs] freesegmentrange+0x1f7/0x310 [f2fs] f2fsresize_fs+0x118/0x330 [f2fs] __f2fs_ioctl+0x487/0x3680 [f2fs] __x64sysioctl+0x8e/0xd0 dosyscall64+0x33/0x80 entrySYSCALL64afterhwframe+0x44/0xa9

The root cause is we forgot to check that whether we have enough space in resized filesystem to store all valid blocks in before-resizing filesystem, then allocator will run out-of-space during block migration in freesegmentrange().

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "5.8"
            },
            {
                "fixed": "5.10.38"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.11.22"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.12"
            },
            {
                "fixed": "5.12.5"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47007.json"