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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-47699

nilfs2: fix potential null-ptr-deref in nilfs_btree_insert()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential null-ptr-deref in nilfs_btree_insert() Patch series "nilfs2: fix potential issues with empty b-tree nodes". This series addresses three potential issues with empty b-tree nodes that can occur with corrupted filesystem images, including one recently discovered by syzbot. This patch (of 3): If a b-tree is broken on the device, and the b-tree height is greater than 2 (the level of the root node is greater than 1) even if the number of child nodes of the b-tree root is 0, a NULL pointer dereference occurs in nilfs_btree_prepare_insert(), which is called from nilfs_btree_insert(). This is because, when the number of child nodes of the b-tree root is 0, nilfs_btree_do_lookup() does not set the block buffer head in any of path[x].bp_bh, leaving it as the initial value of NULL, but if the level of the b-tree root node is greater than 1, nilfs_btree_get_nonroot_node(), which accesses the buffer memory of path[x].bp_bh, is called. Fix this issue by adding a check to nilfs_btree_root_broken(), which performs sanity checks when reading the root node from the device, to detect this inconsistency. Thanks to Lizhi Xu for trying to solve the bug and clarifying the cause early on.

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

  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0affected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343affected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 24bf40740a3da6b4056721da34997ae6938f3da1affected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 73d23ecf234b7a6d47fb883f2dabe10e3230b31daffected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < f68523e0f26faade18833fbef577a4295d8e2c94affected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34affected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < db73500d3f0e558eb642aae1d4782e7726b4a03faffected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 3644554d308ddf2669e459a1551a7edf60b2d62baffected
  • 17c76b0104e4a6513983777e1a17e0297a12b0c4 to < 9403001ad65ae4f4c5de368bdda3a0636b51d51aaffected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 4.19.323 to ≤ 4.19.*unaffected
  • 5.4.285 to ≤ 5.4.*unaffected
  • 5.10.227 to ≤ 5.10.*unaffected
  • 5.15.168 to ≤ 5.15.*unaffected
  • 6.1.113 to ≤ 6.1.*unaffected
  • 6.6.54 to ≤ 6.6.*unaffected
  • 6.10.13 to ≤ 6.10.*unaffected
  • 6.11.2 to ≤ 6.11.*unaffected
  • 6.12 to ≤ *unaffected

References