CVE-2024-44939

jfs: fix null ptr deref in dtInsertEntry

State: Published
Severity: 7.8 High
Published: Aug 26, 2024
Updated: Aug 5, 2026
Reserved: Aug 21, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

jfs: fix null ptr deref in dtInsertEntry

[syzbot reported] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713 ... [Analyze] In dtInsertEntry(), when the pointer h has the same value as p, after writing name in UniStrncpy_to_le(), p->header.flag will be cleared. This will cause the previously true judgment "p->header.flag & BT-LEAF" to change to no after writing the name operation, this leads to entering an incorrect branch and accessing the uninitialized object ih when judging this condition for the second time.

[Fix] After got the page, check freelist first, if freelist == 0 then exit dtInsert() and return -EINVAL.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f98bf80b20f4a930589cda48a35f751a64fe0dc2Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 53023ab11836ac56fd75f7a71ec1356e50920fa9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6ea10dbb1e6c58384136e9adfd75f81951e423f6Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9c2ac38530d1a3ee558834dfa16c85a40fd0e702Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ce6dede912f064a855acf6f04a04cbb2c25b8c8cAffected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.15.189 through 5.15.Not affected 6.1.107 through 6.1.Not affected 6.6.47 through 6.6.Not affected 6.10.6 through 6.10.Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f98bf80b20f4a930589cda48a35f751a64fe0dc2Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 53023ab11836ac56fd75f7a71ec1356e50920fa9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6ea10dbb1e6c58384136e9adfd75f81951e423f6Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9c2ac38530d1a3ee558834dfa16c85a40fd0e702Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ce6dede912f064a855acf6f04a04cbb2c25b8c8cAffected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.15.189 through 5.15.*Not affected
6.1.107 through 6.1.*Not affected
6.6.47 through 6.6.*Not affected
6.10.6 through 6.10.*Not affected
6.11 and laterNot affected

References

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