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Statically allocate UART Receive buffers#248
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The existing dynamic UART receive buffer allocation has problematic issues. The malloc() may fail, and the code proceeds with a null buffer. Earlier code failed to free() and ran out of memory.
The current code frees the receive buffer while Rx interrupts are still enabled, causing use-after-free.
For these two fixed-size UART buffers, dynamic allocation is not needed and the code is better served by static allocation.