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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2022-50286

ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d40e09f701cf7a44e595a558b067b2b4f67fbf87 to < f83391339d8493b9ff24167516aaa5a5e88d8f81affected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < 6f4200ec76a0d31200c308ec5a71c68df5417004affected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < 9404839e0c9db5a517ea83c0ca3388b39d105fdfaffected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < d440d6427a5e3a877c1c259b8d2b216ddb65e185affected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193affected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < 81b915181c630ee1cffa052e52874fe4e1ba91acaffected
  • 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 to < 131294c35ed6f777bd4e79d42af13b5c41bf2775affected
  • 4.19.270 to < 4.19.271affected

Linux Linux

Default version status: affected

  • 4.20affected
  • 0 to < 4.20unaffected
  • 4.19.271 to ≤ 4.19.*unaffected
  • 5.4.229 to ≤ 5.4.*unaffected
  • 5.10.163 to ≤ 5.10.*unaffected
  • 5.15.87 to ≤ 5.15.*unaffected
  • 6.0.18 to ≤ 6.0.*unaffected
  • 6.1.4 to ≤ 6.1.*unaffected
  • 6.2 to ≤ *unaffected

References