Description
In the Linux kernel, the following vulnerability has been resolved: regulator: core: fix locking in regulator_resolve_supply() error path If late enabling of a supply regulator fails in regulator_resolve_supply(), the code currently triggers a lockdep warning: WARNING: drivers/regulator/core.c:2649 at _regulator_put+0x80/0xa0, CPU#6: kworker/u32:4/596 ... Call trace: _regulator_put+0x80/0xa0 (P) regulator_resolve_supply+0x7cc/0xbe0 regulator_register_resolve_supply+0x28/0xb8 as the regulator_list_mutex must be held when calling _regulator_put(). To solve this, simply switch to using regulator_put(). While at it, we should also make sure that no concurrent access happens to our rdev while we clear out the supply pointer. Add appropriate locking to ensure that. While the code in question will be removed altogether in a follow-up commit, I believe it is still beneficial to have this corrected before removal for future reference.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
36a1f1b6ddc6d1442424e29548e790633ca39c7b to < e77357dc2293283fc08a485b1e2e571d91d02622affected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < a8a2eab1166bc33ee38ca371cff425bdb5681e47affected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < 60747114fd2a38739130b715e7b2d40ce848f0beaffected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < c84860dac7af7dc3c3e3c9ae86d65e222c2f3b0caffected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < 3b7fffd7a8984a1c009f668765ee7631fd6b87c8affected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < bde74af8d4466213007bdd42cc85fa72c861dea7affected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < c66e0db0f37290b53c57994f998bb55590364fd0affected36a1f1b6ddc6d1442424e29548e790633ca39c7b to < 497330b203d2c59c5ff3fa4c34d14494d7203bc3affected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected5.10.260 to ≤ 5.10.*unaffected5.15.211 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.37 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e77357dc2293283fc08a485b1e2e571d91d02622 ↗
- https://git.kernel.org/stable/c/a8a2eab1166bc33ee38ca371cff425bdb5681e47 ↗
- https://git.kernel.org/stable/c/60747114fd2a38739130b715e7b2d40ce848f0be ↗
- https://git.kernel.org/stable/c/c84860dac7af7dc3c3e3c9ae86d65e222c2f3b0c ↗
- https://git.kernel.org/stable/c/3b7fffd7a8984a1c009f668765ee7631fd6b87c8 ↗
- https://git.kernel.org/stable/c/bde74af8d4466213007bdd42cc85fa72c861dea7 ↗
- https://git.kernel.org/stable/c/c66e0db0f37290b53c57994f998bb55590364fd0 ↗
- https://git.kernel.org/stable/c/497330b203d2c59c5ff3fa4c34d14494d7203bc3 ↗