ptouch-print

m/ptouch-print

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Commit Graph

Author	SHA1	Message	Date
Tobias KlausmannandDominic Radermacher	c8ce56e054	libptouch: fix stack buffer overflow in ptouch_sendraster The raster packet buffer was fixed at 64 bytes, but a full raster line is max_px/8 bytes plus up to 4 header bytes. For printers with a printhead wider than 480px this overflows the buffer and smashes the stack. No previously supported printer was wide enough to trigger it (the widest, PT-9200DX at 384px, needs 52 bytes), but a 560px printhead needs 74. Size the buffer to 128 bytes, which is the maximum a single packet can be since ptouch_send() caps transfers at 128 bytes.	2026-07-18 07:52:44 +02:00

Author

SHA1

Message

Date

Tobias KlausmannandDominic Radermacher

c8ce56e054

libptouch: fix stack buffer overflow in ptouch_sendraster

The raster packet buffer was fixed at 64 bytes, but a full raster line is
max_px/8 bytes plus up to 4 header bytes. For printers with a printhead
wider than 480px this overflows the buffer and smashes the stack. No
previously supported printer was wide enough to trigger it (the widest,
PT-9200DX at 384px, needs 52 bytes), but a 560px printhead needs 74.

Size the buffer to 128 bytes, which is the maximum a single packet can be
since ptouch_send() caps transfers at 128 bytes.

2026-07-18 07:52:44 +02:00