CVE-2022-49914

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < b1dc9019bb5f89abae85645de1a2dd4830c1f8e9affected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < cded2c89774b99b67c98147ae103ea878c92a206affected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < 2c0329406bb28109c07c6e23e5e3e0fa618a95d7affected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < a52e24c7fcc3c5ce3588a14e3663c00868d36623affected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < 6ba3479f9e96b9ad460c7e77abc26dd16e5dec4faffected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < 396515db923ad5cbeb179d6b88927870b4cbebb7affected
LinuxLinux3301958b7c1dae8f0f5ded63aa881e0b71e78464 < 5614dc3a47e3310fbc77ea3b67eaadd1c6417bf1affected
LinuxLinux3.5affected
LinuxLinux0 < 3.5unaffected
LinuxLinux4.14.299 <= 4.14.*unaffected
LinuxLinux4.19.265 <= 4.19.*unaffected
LinuxLinux5.4.224 <= 5.4.*unaffected
LinuxLinux5.10.154 <= 5.10.*unaffected
LinuxLinux5.15.78 <= 5.15.*unaffected
LinuxLinux6.0.8 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

References