CVE-2023-52887

In the Linux kernel, the following vulnerability has been resolved:

net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new

This patch enhances error handling in scenarios with RTS (Request to

Send) messages arriving closely. It replaces the less informative WARN_ON_ONCE

backtraces with a new error handling method. This provides clearer error

messages and allows for the early termination of problematic sessions.

Previously, sessions were only released at the end of j1939_xtp_rx_rts().

Potentially this could be reproduced with something like:

testj1939 -r vcan0:0x80 &

while true; do

# send first RTS

cansend vcan0 18EC8090#1014000303002301;

# send second RTS

cansend vcan0 18EC8090#1014000303002301;

# send abort

cansend vcan0 18EC8090#ff00000000002301;

done