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Message-ID: <2025010811-CVE-2024-56774-e09f@gregkh> Date: Wed, 8 Jan 2025 18:49:12 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-56774: btrfs: add a sanity check for btrfs root in btrfs_search_slot() Description =========== In the Linux kernel, the following vulnerability has been resolved: btrfs: add a sanity check for btrfs root in btrfs_search_slot() Syzbot reports a null-ptr-deref in btrfs_search_slot(). The reproducer is using rescue=ibadroots, and the extent tree root is corrupted thus the extent tree is NULL. When scrub tries to search the extent tree to gather the needed extent info, btrfs_search_slot() doesn't check if the target root is NULL or not, resulting the null-ptr-deref. Add sanity check for btrfs root before using it in btrfs_search_slot(). The Linux kernel CVE team has assigned CVE-2024-56774 to this issue. Affected and fixed versions =========================== Issue introduced in 5.11 with commit 42437a6386ffeaaf200731e73d723ea491f3fe7d and fixed in 5.15.174 with commit c71d114ef68c95da5a82ec85a721ab31f5bd905b Issue introduced in 5.11 with commit 42437a6386ffeaaf200731e73d723ea491f3fe7d and fixed in 6.1.120 with commit db66fb87c21e8ae724886e6a464dcbac562a64c6 Issue introduced in 5.11 with commit 42437a6386ffeaaf200731e73d723ea491f3fe7d and fixed in 6.6.64 with commit 757171d1369b3b47f36932d40a05a0715496dcab Issue introduced in 5.11 with commit 42437a6386ffeaaf200731e73d723ea491f3fe7d and fixed in 6.12.4 with commit 93992c3d9629b02dccf6849238559d5c24f2dece Issue introduced in 5.11 with commit 42437a6386ffeaaf200731e73d723ea491f3fe7d and fixed in 6.13-rc2 with commit 3ed51857a50f530ac7a1482e069dfbd1298558d4 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-56774 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: fs/btrfs/ctree.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/c71d114ef68c95da5a82ec85a721ab31f5bd905b https://git.kernel.org/stable/c/db66fb87c21e8ae724886e6a464dcbac562a64c6 https://git.kernel.org/stable/c/757171d1369b3b47f36932d40a05a0715496dcab https://git.kernel.org/stable/c/93992c3d9629b02dccf6849238559d5c24f2dece https://git.kernel.org/stable/c/3ed51857a50f530ac7a1482e069dfbd1298558d4
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