Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: of/overlay: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. The store is guarded by ovcs->fragments because on the allocation-failure path cnt still holds the counting pass total while there is no fragments array; everywhere else cnt only counts fully-initialized fragments.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 702b5db6e7b3865be70675d57d6fd7dde80d02b6; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 894573e2fdaeb1b15030b7eebc22615edf28a6cd; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 7a46f1917b320cc8762183b802301da02a191b6a; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 3a23fb158ba517b77a2e5258263bdfdaa480f758; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/702b5db6e7b3865be70675d57d6fd7dde80d02b6
- https://git.kernel.org/stable/c/894573e2fdaeb1b15030b7eebc22615edf28a6cd
- https://git.kernel.org/stable/c/7a46f1917b320cc8762183b802301da02a191b6a
- https://git.kernel.org/stable/c/3a23fb158ba517b77a2e5258263bdfdaa480f758
- https://git.kernel.org/stable/c/1d62f0f2bc7edb12ed09f71203df0e47fa4efca4