Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: regulator: core: regulator_lock_two() should test for EDEADLK not EDEADLOCK Compare against -EDEADLK, which is what ww_mutex_lock() actually returns and what every other deadlock check in this file already uses. Function regulator_lock_two() acquires two regulators via regulator_lock_nested() -> ww_mutex_lock(). On contention, ww_mutex_lock() returns -EDEADLK, which is the caller's signal to drop the lock it holds and retry the acquisition in the canonical order. However, regulator_lock_two() tests the return value against -EDEADLOCK rather than -EDEADLK. On most architectures, EDEADLK and EDEADLOCK are the same value, so the comparison happens to be correct and the bug is invisible. But on MIPS, SPARC, and PowerPC, those two errors have different values. The test is wrong: a genuine -EDEADLK backoff no longer matches -EDEADLOCK, so instead of unlocking and retrying, the code falls into WARN_ON(ret) and returns with only one of the two regulators locked. In practice, this is a bug only on MIPS, because the regulator core is not built or used on the other two platforms. In general, EDEADLK is preferred over EDEADLOCK for new code.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 06140d6dfe720d80566f792b4e28a9cd60a67970 before dc804f390fddd9c389edf0976356942e16878d8f; affected 1e3056b8067c2e9b7741c4e588f0acacbe4bdafc before 8e39aa63798ea0a797fd9341419f12ef91df3238; affected 849ab4cf182b38e562ffcc1b494d510e948822dd before 0c305eac40470a224671858a215963b070f9b2a9; affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 before 29a7953e9adea6c7f9e64947745b79158e7cea7f; affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 before e2063307ea3b6da74585129ba7b588e8243e2ef0; affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 before 346e2d666a29ae7233c56b356a0487eb1d42589b; affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 before 153d1b8b5bc30847eb70ad535f62f289aa9217e6; affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 before d38f8bd771c4999b797d7074b348cf201414bd34; affected 5224ea575196db11c0a909a78ea426ccdb92f064; affected 435c65af581a61ca249bd8f717c3a147dc119f11; affected cdc042430ea9e07f77ce05a9d29e227dbdecc733; affected 5.10.180 before 5.10.261; affected 5.15.111 before 5.15.212; affected 6.1.28 before 6.1.178; affected 5.4.243 before 5.5; affected 6.2.15 before 6.3; affected 6.3.2 before 6.4 |
| Linux / Linux | affected 6.4; unaffected 0 before 6.4; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dc804f390fddd9c389edf0976356942e16878d8f
- https://git.kernel.org/stable/c/8e39aa63798ea0a797fd9341419f12ef91df3238
- https://git.kernel.org/stable/c/0c305eac40470a224671858a215963b070f9b2a9
- https://git.kernel.org/stable/c/29a7953e9adea6c7f9e64947745b79158e7cea7f
- https://git.kernel.org/stable/c/e2063307ea3b6da74585129ba7b588e8243e2ef0
- https://git.kernel.org/stable/c/346e2d666a29ae7233c56b356a0487eb1d42589b
- https://git.kernel.org/stable/c/153d1b8b5bc30847eb70ad535f62f289aa9217e6
- https://git.kernel.org/stable/c/d38f8bd771c4999b797d7074b348cf201414bd34
ADP enrichment
No English description supplied.
No references supplied.