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sensor_poll() arms a per-subscriber watchdog for fetch()-only sensors with a requested interval. The watchdog handler sensor_fetch_expired() dereferences the subscriber and re-arms itself unless user->fds is NULL. sensor_poll() teardown clears user->fds and cancels the watchdog, but sensor_close() removed the subscriber from the user list and freed it without doing either. A close() racing an armed timer therefore lets the handler run after the subscriber is freed, causing a timer-context use-after-free and re-arm of a freed watchdog. Mirror the poll teardown in sensor_close(): clear user->fds and cancel user->wdog under upper->lock before notifying other users and freeing the subscriber. Fixes #20145. Signed-off-by: arnavsharma990 <2006arnavsharma@gmail.com> |
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Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.