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Message-ID: <2025050106-CVE-2022-49914-42a6@gregkh> Date: Thu, 1 May 2025 16:11:44 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-49914: btrfs: fix inode list leak during backref walking at resolve_indirect_refs() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: btrfs: fix inode list leak during backref walking at resolve_indirect_refs() During backref walking, at resolve_indirect_refs(), if we get an error we jump to the 'out' label and call ulist_free() on the 'parents' ulist, which frees all the elements in the ulist - however that does not free any inode lists that may be attached to elements, through the 'aux' field of a ulist node, so we end up leaking lists if we have any attached to the unodes. Fix this by calling free_leaf_list() instead of ulist_free() when we exit from resolve_indirect_refs(). The static function free_leaf_list() is moved up for this to be possible and it's slightly simplified by removing unnecessary code. The Linux kernel CVE team has assigned CVE-2022-49914 to this issue. Affected and fixed versions =========================== Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 4.14.299 with commit b1dc9019bb5f89abae85645de1a2dd4830c1f8e9 Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 4.19.265 with commit cded2c89774b99b67c98147ae103ea878c92a206 Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 5.4.224 with commit 2c0329406bb28109c07c6e23e5e3e0fa618a95d7 Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 5.10.154 with commit a52e24c7fcc3c5ce3588a14e3663c00868d36623 Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 5.15.78 with commit 6ba3479f9e96b9ad460c7e77abc26dd16e5dec4f Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 6.0.8 with commit 396515db923ad5cbeb179d6b88927870b4cbebb7 Issue introduced in 3.5 with commit 3301958b7c1dae8f0f5ded63aa881e0b71e78464 and fixed in 6.1 with commit 5614dc3a47e3310fbc77ea3b67eaadd1c6417bf1 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-2022-49914 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/backref.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/b1dc9019bb5f89abae85645de1a2dd4830c1f8e9 https://git.kernel.org/stable/c/cded2c89774b99b67c98147ae103ea878c92a206 https://git.kernel.org/stable/c/2c0329406bb28109c07c6e23e5e3e0fa618a95d7 https://git.kernel.org/stable/c/a52e24c7fcc3c5ce3588a14e3663c00868d36623 https://git.kernel.org/stable/c/6ba3479f9e96b9ad460c7e77abc26dd16e5dec4f https://git.kernel.org/stable/c/396515db923ad5cbeb179d6b88927870b4cbebb7 https://git.kernel.org/stable/c/5614dc3a47e3310fbc77ea3b67eaadd1c6417bf1
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