Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: USB: gadget: dummy-hcd: Fix wait for outstanding request completions The dummy-hcd driver emulates synchronize_irq() by waiting until its private callback_usage counter drops to 0 (with the private lock not held). This counter is incremented whenever a gadget driver callback occurs (which requires the private lock to be dropped), but not when a request completion handler is called. This is an oversight. Request completion is triggered by timer interrupts (emulating device IRQs in a real UDC), and the interrupt handlers are supposed to have completed when the synchronize_irq() emulation routine returns -- they aren't supposed to be in the middle of a completion callback. If this happens it can lead to a gadget driver's unbind routine running before all outstanding request completions have finished, maybe even allowing the gadget driver's module to be unloaded while a completion handler is still running. Fix the oversight by incrementing the callback_usage value across request completion callbacks.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 6849e51b89de5b6fc7447dc8e612b58df19c7dea; affected 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2; affected 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 5298c96bf0068f3160969f7ddad81976d01a9b66; affected 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 3070806a7bc7bb36ed04a21022c09dafcc5619f4; affected 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before b263ff9b0fc5c1f371d65c4eb196b31263d039ff; affected 7b416b9dac6ede26d4ca0c1a88b448b543623ff3; affected 8590bc1da625dd4a589eac0fc3aa3cf4f400424d; affected a867d5b932ac4911d3f8a1e63505061b0c81f889; affected e84b4a008365b7edbd842a063ae28d040a98db25; affected e39b17143a5b5aac81f066d455e5d3a9877eb3ae; affected 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715; affected 3.2.97 before 3.3; affected 3.16.52 before 3.17; affected 4.1.46 before 4.2; affected 4.4.92 before 4.5; affected 4.9.55 before 4.10; affected 4.13.6 before 4.14 |
| Linux / Linux | affected 4.14; unaffected 0 before 4.14; 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/6849e51b89de5b6fc7447dc8e612b58df19c7dea
- https://git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2
- https://git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66
- https://git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4
- https://git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff