[PR] net/icmp: Fix devif_loopback dead loop when unrecognized ICMP packet [nuttx]

["13627105546 (via GitHub)" <gi...@apache.org>]

13627105546 opened a new pull request, #17890:
URL: https://github.com/apache/nuttx/pull/17890

   
   *Note: Please adhere to [Contributing Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
   
   ## Summary
   
   When an unrecognized ICMP (type=3, code=2) packet is received, the ICMP flow does not set dev->d_len to 0, causing a devif_loopback dead loop.
   
   Therefore, in ICMP input processing, when an ICMP_DEST_UNREACHABLE message is received, if it is not ICMP_FRAG_NEEDED code, jump to typeerr for proper error handling.
   
   ## Impact
   
   Fixes a endless loop in devif_loopback when handling unrecognized ICMP packets (specifically type 3, code 2). This improves system stability when facing unexpected network traffic.
   
   ## Testing
   
   Verified with ICMP packets (type=3, code=2). The system no longer enters a dead loop and correctly handles the error.
   


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Re: [PR] net/icmp: Fix devif_loopback dead loop when unrecognized ICMP packet [nuttx]

["anchao (via GitHub)" <gi...@apache.org>]

anchao merged PR #17890:
URL: https://github.com/apache/nuttx/pull/17890


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