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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-46959

spi: Fix use-after-free with devm_spi_alloc_*

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: spi: Fix use-after-free with devm_spi_alloc_* We can't rely on the contents of the devres list during spi_unregister_controller(), as the list is already torn down at the time we perform devres_find() for devm_spi_release_controller. This causes devices registered with devm_spi_alloc_{master,slave}() to be mistakenly identified as legacy, non-devm managed devices and have their reference counters decremented below 0. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98) [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24) r4:b6700140 [<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40) [<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (device_driver_detach) from [<b044d274>] (unbind_store+0xe4/0xf8) Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.

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

  • a4add022c1552b0d51a0b89a4781919d6ebac4f9 to < 62bb2c7f2411a0045c24831f11ecacfc35610815affected
  • 0870525cf94bc27907e94ce99afb6d7239ffd2f5 to < 8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0eaffected
  • 8c45a1c6c951bbe7f95db78fcab46f7337364468 to < 8e029707f50a82c53172359c686b2536ab54e58caffected
  • 234b432c7b6184b2d6c5ba2c55f0dd5023c0edf0 to < 28a5529068c51cdf0295ab1e11a99a3a909a03e4affected
  • 3e04a4976addbedcad326f47b0dd4efc570a1fac to < 001c8e83646ad3b847b18f6ac55a54367d917d74affected
  • 5e844cc37a5cbaa460e68f9a989d321d63088a89 to < c7fabe372a9031acd00498bc718ce27c253abfd1affected
  • 5e844cc37a5cbaa460e68f9a989d321d63088a89 to < cee78aa24578edac8cf00513dca618c0acc17cd7affected
  • 5e844cc37a5cbaa460e68f9a989d321d63088a89 to < 8735248ebb918d25427965f0db07939ed0473ec6affected
  • 5e844cc37a5cbaa460e68f9a989d321d63088a89 to < 794aaf01444d4e765e2b067cba01cc69c1c68ed9affected
  • bd1a5b2307279029faaddbecf2f2ac25eaef8dc6affected
  • 4.4.248 to < 4.4.271affected
  • 4.9.248 to < 4.9.271affected
  • 4.14.212 to < 4.14.233affected
  • 4.19.163 to < 4.19.191affected
  • 5.4.80 to < 5.4.119affected
  • 5.9.11 to < 5.10affected

Linux Linux

Default version status: affected

  • 5.10affected
  • 0 to < 5.10unaffected
  • 4.4.271 to ≤ 4.4.*unaffected
  • 4.9.271 to ≤ 4.9.*unaffected
  • 4.14.233 to ≤ 4.14.*unaffected
  • 4.19.191 to ≤ 4.19.*unaffected
  • 5.4.119 to ≤ 5.4.*unaffected
  • 5.10.37 to ≤ 5.10.*unaffected
  • 5.11.21 to ≤ 5.11.*unaffected
  • 5.12.4 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References