Linux CAN ISOTP: Fix tx state handling and timer split to prevent panic_on_warn

Key Information Vulnerability Type: CAN ISOTP timer transaction timeout issue Fix Description: - Previously, the CAN ISOTP protocol stack had two functionalities: 1. Sending two consecutive frames with a specified time interval. 2. Monitoring timeouts for flow control frames and echo frames. - This led to more complex state checks, and during testing, an issue triggered by syzbot was discovered, which enabled the feature. - Now, the function has been split into and , each handling one of the above functionalities with separate timer callbacks. - The two simplified timers now run in one-shot mode, making state transitions (especially those related to ) easier to understand. Fix Commit: - Fixes the issue introduced by commit 86033786f57 ("can: isotp: fix tx state handling for echo tx processing"). - Committer: syzbot+5adee33abab61f5b017@syzkaller.appspotmail.com - Signer: Oliver Hartkopp - Link: https://lore.kernel.org/all/20230104145701.2422-1-socketcan@hartkopp.net Code Changes: - Modified , with 65 lines changed: 21 insertions, 36 deletions. - Major changes include: - Adding and to . - Updating and functions to handle the new timer logic. - Removing old timers in and functions. Impact: - Improves the stability and maintainability of the CAN ISOTP protocol stack, avoiding potential issues.

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Linux CAN ISOTP: Fix tx state handling and timer split to prevent panic_on_warn