CVE-2024-44939: jfs: fix null ptr deref in dtInsertEntry
First published: Mon Aug 26 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.6.47 | |
| Linux Linux kernel | >=6.7<6.10.6 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9
- https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6
- https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702
- https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44939
- https://nvd.nist.gov/vuln/detail/CVE-2024-44939
- https://launchpad.net/bugs/cve/CVE-2024-44939
- https://security-tracker.debian.org/tracker/CVE-2024-44939
- https://ubuntu.com/security/CVE-2024-44939
- https://git.kernel.org/linus/ce6dede912f064a855acf6f04a04cbb2c25b8c8c
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