{"id":"CVE-2024-44939","summary":"jfs: fix null ptr deref in dtInsertEntry","details":"In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix null ptr deref in dtInsertEntry\n\n[syzbot reported]\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nRIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713\n...\n[Analyze]\nIn dtInsertEntry(), when the pointer h has the same value as p, after writing\nname in UniStrncpy_to_le(), p-\u003eheader.flag will be cleared. This will cause the\npreviously true judgment \"p-\u003eheader.flag & BT-LEAF\" to change to no after writing\nthe name operation, this leads to entering an incorrect branch and accessing the\nuninitialized object ih when judging this condition for the second time.\n\n[Fix]\nAfter got the page, check freelist first, if freelist == 0 then exit dtInsert()\nand return -EINVAL.","modified":"2026-04-02T12:18:31.300154Z","published":"2024-08-26T11:20:44.129Z","related":["MGASA-2024-0309","MGASA-2024-0310","SUSE-SU-2024:3190-1","SUSE-SU-2024:3194-1","SUSE-SU-2024:3195-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3383-1","SUSE-SU-2024:3483-1","SUSE-SU-2025:20044-1","SUSE-SU-2025:20047-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44939.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f98bf80b20f4a930589cda48a35f751a64fe0dc2"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44939.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-44939"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"f98bf80b20f4a930589cda48a35f751a64fe0dc2"},{"fixed":"53023ab11836ac56fd75f7a71ec1356e50920fa9"},{"fixed":"6ea10dbb1e6c58384136e9adfd75f81951e423f6"},{"fixed":"9c2ac38530d1a3ee558834dfa16c85a40fd0e702"},{"fixed":"ce6dede912f064a855acf6f04a04cbb2c25b8c8c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44939.json"}}],"schema_version":"1.7.5"}