{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-44939",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-44939"
  ],
  "published": "2024-08-26T11:21:31Z",
  "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->header.flag will be cleared. This will cause the\npreviously true judgment \"p->header.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.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-44939"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f98bf80b20f4a930589cda48a35f751a64fe0dc2"
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      "url": "https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9"
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6"
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      "url": "https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702"
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      "type": "FIX",
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
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}