CVE-2022-50286 (GCVE-0-2022-50286)
Vulnerability from cvelistv5
Published
2025-09-15 14:21
Modified
2025-09-15 14:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline When converting files with inline data to extents, delayed allocations made on a file system created with both the bigalloc and inline options can result in invalid extent status cache content, incorrect reserved cluster counts, kernel memory leaks, and potential kernel panics. With bigalloc, the code that determines whether a block must be delayed allocated searches the extent tree to see if that block maps to a previously allocated cluster. If not, the block is delayed allocated, and otherwise, it isn't. However, if the inline option is also used, and if the file containing the block is marked as able to store data inline, there isn't a valid extent tree associated with the file. The current code in ext4_clu_mapped() calls ext4_find_extent() to search the non-existent tree for a previously allocated cluster anyway, which typically finds nothing, as desired. However, a side effect of the search can be to cache invalid content from the non-existent tree (garbage) in the extent status tree, including bogus entries in the pending reservation tree. To fix this, avoid searching the extent tree when allocating blocks for bigalloc + inline files that are being converted from inline to extent mapped.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/131294c35ed6f777bd4e79d42af13b5c41bf2775
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f4200ec76a0d31200c308ec5a71c68df5417004
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81b915181c630ee1cffa052e52874fe4e1ba91ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9404839e0c9db5a517ea83c0ca3388b39d105fdf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d440d6427a5e3a877c1c259b8d2b216ddb65e185
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline\n\nWhen converting files with inline data to extents, delayed allocations\nmade on a file system created with both the bigalloc and inline options\ncan result in invalid extent status cache content, incorrect reserved\ncluster counts, kernel memory leaks, and potential kernel panics.\n\nWith bigalloc, the code that determines whether a block must be\ndelayed allocated searches the extent tree to see if that block maps\nto a previously allocated cluster.  If not, the block is delayed\nallocated, and otherwise, it isn\u0027t.  However, if the inline option is\nalso used, and if the file containing the block is marked as able to\nstore data inline, there isn\u0027t a valid extent tree associated with\nthe file.  The current code in ext4_clu_mapped() calls\next4_find_extent() to search the non-existent tree for a previously\nallocated cluster anyway, which typically finds nothing, as desired.\nHowever, a side effect of the search can be to cache invalid content\nfrom the non-existent tree (garbage) in the extent status tree,\nincluding bogus entries in the pending reservation tree.\n\nTo fix this, avoid searching the extent tree when allocating blocks\nfor bigalloc + inline files that are being converted from inline to\nextent mapped."
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    "dateReserved": "2025-09-15T13:58:00.977Z",
    "dateUpdated": "2025-09-15T14:21:22.489Z",
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  }
}


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