{
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    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47117",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed\n\nWe got follow bug_on when run fsstress with injecting IO fault:\n[130747.323114] kernel BUG at fs/ext4/extents_status.c:762!\n[130747.323117] Internal error: Oops - BUG: 0 [#1] SMP\n......\n[130747.334329] Call trace:\n[130747.334553]  ext4_es_cache_extent+0x150/0x168 [ext4]\n[130747.334975]  ext4_cache_extents+0x64/0xe8 [ext4]\n[130747.335368]  ext4_find_extent+0x300/0x330 [ext4]\n[130747.335759]  ext4_ext_map_blocks+0x74/0x1178 [ext4]\n[130747.336179]  ext4_map_blocks+0x2f4/0x5f0 [ext4]\n[130747.336567]  ext4_mpage_readpages+0x4a8/0x7a8 [ext4]\n[130747.336995]  ext4_readpage+0x54/0x100 [ext4]\n[130747.337359]  generic_file_buffered_read+0x410/0xae8\n[130747.337767]  generic_file_read_iter+0x114/0x190\n[130747.338152]  ext4_file_read_iter+0x5c/0x140 [ext4]\n[130747.338556]  __vfs_read+0x11c/0x188\n[130747.338851]  vfs_read+0x94/0x150\n[130747.339110]  ksys_read+0x74/0xf0\n\nThis patch's modification is according to Jan Kara's suggestion in:\nhttps://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/\n\"I see. Now I understand your patch. Honestly, seeing how fragile is trying\nto fix extent tree after split has failed in the middle, I would probably\ngo even further and make sure we fix the tree properly in case of ENOSPC\nand EDQUOT (those are easily user triggerable).  Anything else indicates a\nHW problem or fs corruption so I'd rather leave the extent tree as is and\ndon't try to fix it (which also means we will not create overlapping\nextents).\""
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "1da177e4c3f4",
                                            "version_value": "e33bafad30d3"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.4.272",
                                                        "lessThanOrEqual": "4.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.9.272",
                                                        "lessThanOrEqual": "4.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.14.236",
                                                        "lessThanOrEqual": "4.14.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.19.194",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.4.125",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.43",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.12.10",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.13",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
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                            }
                        ]
                    }
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            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb"
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            {
                "url": "https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071"
            },
            {
                "url": "https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9",
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                "name": "https://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9"
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                "url": "https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107"
            },
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7"
            },
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                "url": "https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a"
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                "url": "https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c"
            },
            {
                "url": "https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68"
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