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authorBruno Prémont <bonbons@linux-vserver.org>2011-05-04 21:08:42 +0200
committerJiri Kosina <jkosina@suse.cz>2011-05-05 13:45:52 +0200
commit8c4e708d01424f88afde64a96ffd05146c9978b8 (patch)
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parent6d67c110ab204bc4c2f4f3e368b8d7cf1f38a4f8 (diff)
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HID: picolcd: Avoid compile warning/error triggered by copy_from_user()
With CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y compilation of PicoLCD driver fails on copy_from_user(), without it a warning is generated: CC [M] drivers/hid/hid-picolcd.o In file included from /usr/src/linux-2.6/arch/x86/include/asm/uaccess.h:571, from /usr/src/linux-2.6/arch/x86/include/asm/sections.h:5, from /usr/src/linux-2.6/arch/x86/include/asm/hw_irq.h:26, from /usr/src/linux-2.6/include/linux/irq.h:359, from /usr/src/linux-2.6/arch/x86/include/asm/hardirq.h:5, from /usr/src/linux-2.6/include/linux/hardirq.h:7, from /usr/src/linux-2.6/include/linux/interrupt.h:12, from /usr/src/linux-2.6/include/linux/usb.h:15, from /usr/src/linux-2.6/drivers/hid/hid-picolcd.c:25: In function 'copy_from_user', inlined from 'picolcd_debug_eeprom_write' at drivers/hid/hid-picolcd.c:1592: arch/x86/include/asm/uaccess_32.h:212: error: call to 'copy_from_user_overflow' declared with attribute error: copy_from_user() buffer size is not provably correct gcc-4.4.5 is not able to track size calculation when it is stored into a variable, thus tell copy_from_user() maximum size via min(*max-size*, *effective-size*) explicitly and inline how much to copy at most. Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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