From 93340afddfbc4085a5297fe635b65dd7f7f3ef05 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= Date: Mon, 17 Dec 2018 00:05:43 +0100 Subject: [PATCH] mustek_usb2: Avoid stack smashing. Fixes #35 Use a properly sized variable in call to sanei_usb_{read,write}_bulk. Debian-Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886777 Debian-Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=907972 --- backend/mustek_usb2_asic.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/backend/mustek_usb2_asic.c b/backend/mustek_usb2_asic.c index b5f3b0a4..b31c7494 100644 --- a/backend/mustek_usb2_asic.c +++ b/backend/mustek_usb2_asic.c @@ -255,6 +255,7 @@ Mustek_DMARead (PAsic chip, unsigned int size, SANE_Byte * lpdata) STATUS status = STATUS_GOOD; unsigned int i, buf[1]; unsigned int read_size; + size_t read_size_usb; DBG (DBG_ASIC, "Mustek_DMARead: Enter\n"); @@ -268,9 +269,11 @@ Mustek_DMARead (PAsic chip, unsigned int size, SANE_Byte * lpdata) SetRWSize (chip, 1, buf[0]); status = WriteIOControl (chip, 0x03, 0, 4, (SANE_Byte *) (buf)); + read_size_usb = buf[0]; status = sanei_usb_read_bulk (chip->fd, lpdata + i * read_size, - (size_t *) buf); + &read_size_usb); + buf[0] = read_size_usb; if (status != STATUS_GOOD) { DBG (DBG_ERR, "Mustek_DMARead: read error\n"); @@ -284,9 +287,11 @@ Mustek_DMARead (PAsic chip, unsigned int size, SANE_Byte * lpdata) SetRWSize (chip, 1, buf[0]); status = WriteIOControl (chip, 0x03, 0, 4, (SANE_Byte *) (buf)); + read_size_usb = buf[0]; status = sanei_usb_read_bulk (chip->fd, lpdata + i * read_size, - (size_t *) buf); + &read_size_usb); + buf[0] = read_size_usb; if (status != STATUS_GOOD) { DBG (DBG_ERR, "Mustek_DMARead: read error\n"); @@ -307,6 +312,7 @@ Mustek_DMAWrite (PAsic chip, unsigned int size, SANE_Byte * lpdata) unsigned int buf[1]; unsigned int i; unsigned int write_size; + size_t write_size_usb; DBG (DBG_ASIC, "Mustek_DMAWrite: Enter:size=%d\n", size); @@ -320,9 +326,11 @@ Mustek_DMAWrite (PAsic chip, unsigned int size, SANE_Byte * lpdata) SetRWSize (chip, 0, buf[0]); WriteIOControl (chip, 0x02, 0, 4, (SANE_Byte *) buf); + write_size_usb = buf[0]; status = sanei_usb_write_bulk (chip->fd, lpdata + i * write_size, - (size_t *) buf); + &write_size_usb); + buf[0] = write_size_usb; if (status != STATUS_GOOD) { DBG (DBG_ERR, "Mustek_DMAWrite: write error\n"); @@ -337,9 +345,11 @@ Mustek_DMAWrite (PAsic chip, unsigned int size, SANE_Byte * lpdata) SetRWSize (chip, 0, buf[0]); WriteIOControl (chip, 0x02, 0, 4, (SANE_Byte *) buf); + write_size_usb = buf[0]; status = sanei_usb_write_bulk (chip->fd, lpdata + i * write_size, - (size_t *) buf); + &write_size_usb); + buf[0] = write_size_usb; if (status != STATUS_GOOD) { DBG (DBG_ERR, "Mustek_DMAWrite: write error\n"); -- 2.20.1