lightningd: check value overflow for forward amounts - #9411
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Blinded paths encrypted_recipient_data payment_relay fee_proportional_millionths is a 32 bit unsigned integer. We convert to 64 bits before doing arithmetic operations to avoid integer overflow. **BROKEN** lightningd: FATAL SIGNAL 8 (version v26.06-197-g8c42be3-modded) **BROKEN** lightningd: backtrace: common/daemon.c:46 (send_backtrace) 0x556ac0a6be39 **BROKEN** lightningd: backtrace: common/daemon.c:83 (crashdump) 0x556ac0a6be76 **BROKEN** lightningd: backtrace: ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0 ((null)) 0x7f9c98a31def **BROKEN** lightningd: backtrace: common/onion_decode.c:61 (ceil_div) 0x556ac0a7835d **BROKEN** lightningd: backtrace: common/onion_decode.c:122 (handle_blinded_forward) 0x556ac0a784c4 **BROKEN** lightningd: backtrace: common/onion_decode.c:355 (onion_decode) 0x556ac0a78c39 **BROKEN** lightningd: backtrace: lightningd/peer_htlcs.c:1548 (peer_accepted_htlc) 0x556ac0a087fa **BROKEN** lightningd: backtrace: lightningd/peer_htlcs.c:2648 (peer_got_revoke) 0x556ac0a09e25 **BROKEN** lightningd: backtrace: lightningd/channel_control.c:1624 (channel_msg) 0x556ac09c3e11 **BROKEN** lightningd: backtrace: lightningd/subd.c:562 (sd_msg_read) 0x556ac0a16e2e **BROKEN** lightningd: backtrace: ccan/ccan/io/io.c:60 (next_plan) 0x556ac0aa8fc1 **BROKEN** lightningd: backtrace: ccan/ccan/io/io.c:422 (do_plan) 0x556ac0aa944c **BROKEN** lightningd: backtrace: ccan/ccan/io/io.c:439 (io_ready) 0x556ac0aa9505 **BROKEN** lightningd: backtrace: ccan/ccan/io/poll.c:471 (io_loop) 0x556ac0aaaea3 **BROKEN** lightningd: backtrace: lightningd/io_loop_with_timers.c:22 (io_loop_with_timers) 0x556ac09dea99 **BROKEN** lightningd: backtrace: lightningd/lightningd.c:1518 (main) 0x556ac09e43f7 **BROKEN** lightningd: backtrace: ../sysdeps/nptl/libc_start_call_main.h:58 (__libc_start_call_main) 0x7f9c98a1bca7 **BROKEN** lightningd: backtrace: ../csu/libc-start.c:360 (__libc_start_main_impl) 0x7f9c98a1bd64 **BROKEN** lightningd: backtrace: (null):0 ((null)) 0x556ac09b3120 **BROKEN** lightningd: backtrace: (null):0 ((null)) 0xffffffffffffffff Changelog-Fixed: lightningd: guard for arithmetic operation overflow on onion message request for forward a payment through a blinded path Reported-by: Vincenzo Palazzo (Bitcoin Security Council finding 2026-08-11) Signed-off-by: Lagrang3 <lagrang3@protonmail.com>
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Blinded paths encrypted_recipient_data payment_relay fee_proportional_millionths is a 32 bit unsigned integer. We convert to 64 bits before doing arithmetic operations to avoid integer overflow.