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[PATCH] I2C: Fix incorrect sysfs file permissions in it87 and via686a drivers
The it87 and via686a hardware monitoring drivers each create a sysfs file named "alarms" in R/W mode, while they should really create it in read-only mode. Since we don't provide a store function for these files, write attempts to these files will do something undefined (I guess) and bad (I am sure). My own try resulted in a locked terminal (where I attempted the write) and a 100% CPU load until next reboot. As a side note, wouldn't it make sense to check, when creating sysfs files, that readable files have a non-NULL show method, and writable files have a non-NULL store method? I know drivers are not supposed to do stupid things, but there is already a BUG_ON for several conditions in sysfs_create_file, so maybe we could add two more? Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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parent
0c726347c8
commit
64ffae4fd8
3 changed files with 7 additions and 2 deletions
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@ -631,7 +631,7 @@ static ssize_t show_alarms(struct device *dev, char *buf)
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struct it87_data *data = it87_update_device(dev);
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return sprintf(buf,"%d\n", ALARMS_FROM_REG(data->alarms));
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}
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static DEVICE_ATTR(alarms, S_IRUGO | S_IWUSR, show_alarms, NULL);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static ssize_t
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show_vrm_reg(struct device *dev, char *buf)
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@ -554,7 +554,7 @@ static ssize_t show_alarms(struct device *dev, char *buf) {
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struct via686a_data *data = via686a_update_device(dev);
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return sprintf(buf,"%d\n", ALARMS_FROM_REG(data->alarms));
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}
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static DEVICE_ATTR(alarms, S_IRUGO | S_IWUSR, show_alarms, NULL);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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/* The driver. I choose to use type i2c_driver, as at is identical to both
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smbus_driver and isa_driver, and clients could be of either kind */
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@ -114,6 +114,9 @@ parse_extended(struct parsed_partitions *state, struct block_device *bdev,
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*/
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for (i=0; i<4; i++, p++) {
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u32 offs, size, next;
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if (SYS_IND(p) == 0)
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continue;
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if (!NR_SECTS(p) || is_extended_partition(p))
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continue;
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@ -430,6 +433,8 @@ int msdos_partition(struct parsed_partitions *state, struct block_device *bdev)
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for (slot = 1 ; slot <= 4 ; slot++, p++) {
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u32 start = START_SECT(p)*sector_size;
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u32 size = NR_SECTS(p)*sector_size;
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if (SYS_IND(p) == 0)
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continue;
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if (!size)
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continue;
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if (is_extended_partition(p)) {
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