nilfs2: fix potential null-ptr-deref in nilfs_btree_insert()
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.
CVE-2024-47699
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-47699
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "24bf40740a3da6b4056721da34997ae6938f3da1",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "73d23ecf234b7a6d47fb883f2dabe10e3230b31d",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "f68523e0f26faade18833fbef577a4295d8e2c94",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "db73500d3f0e558eb642aae1d4782e7726b4a03f",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "3644554d308ddf2669e459a1551a7edf60b2d62b",
"versionType": "git"
},
{
"status": "affected",
"version": "17c76b0104e4a6513983777e1a17e0297a12b0c4",
"lessThan": "9403001ad65ae4f4c5de368bdda3a0636b51d51a",
"versionType": "git"
}
],
"programFiles": [
"fs/nilfs2/btree.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.323",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.285",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.227",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.168",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.113",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.54",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.10.13",
"versionType": "semver",
"lessThanOrEqual": "6.10.*"
},
{
"status": "unaffected",
"version": "6.11.2",
"versionType": "semver",
"lessThanOrEqual": "6.11.*"
},
{
"status": "unaffected",
"version": "6.12",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nilfs2/btree.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-47699
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26728 · Revision 1
- Added to Heist Feed
- Publisher date