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| author | Bruno Prémont <bonbons@linux-vserver.org> | 2011-05-04 21:08:42 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2011-05-05 13:45:52 +0200 |
| commit | 8c4e708d01424f88afde64a96ffd05146c9978b8 (patch) | |
| tree | f341d2533527c7eb3e443f0bb0cfc16529bccdde /drivers/hid | |
| parent | 6d67c110ab204bc4c2f4f3e368b8d7cf1f38a4f8 (diff) | |
| download | linux-8c4e708d01424f88afde64a96ffd05146c9978b8.tar.bz2 | |
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>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-picolcd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c index de9cf21b3494..6f0642ea1009 100644 --- a/drivers/hid/hid-picolcd.c +++ b/drivers/hid/hid-picolcd.c @@ -1584,11 +1584,11 @@ static ssize_t picolcd_debug_eeprom_write(struct file *f, const char __user *u, memset(raw_data, 0, sizeof(raw_data)); raw_data[0] = *off & 0xff; raw_data[1] = (*off >> 8) & 0xff; - raw_data[2] = s < 20 ? s : 20; + raw_data[2] = min((size_t)20, s); if (*off + raw_data[2] > 0xff) raw_data[2] = 0x100 - *off; - if (copy_from_user(raw_data+3, u, raw_data[2])) + if (copy_from_user(raw_data+3, u, min((u8)20, raw_data[2]))) return -EFAULT; resp = picolcd_send_and_wait(data->hdev, REPORT_EE_WRITE, raw_data, sizeof(raw_data)); |