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dm raid: fix parse_raid_params() variable range issue 

parse_raid_params() compares variable "int value" with INT_MAX.

E.g. related Coverity report excerpt:
   CID 1364818 (#2 of 3): Operands don't affect result (CONSTANT_EXPRESSION_RESULT) [select issue]
1433                        if (value > INT_MAX) {

Fix by changing checks to avoid INT_MAX.

Whilst on it, avoid unnecessary checks against constants
and add check for sane recovery speed min/max.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Heinz Mauelshagen 2018-03-28 17:07:14 +02:00 committed by Mike Snitzer
parent d4b1aaf53c
commit 13bc62d4a6
1 changed files with 19 additions and 8 deletions
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27
drivers/md/dm-raid.c
View File

@ -1370,19 +1370,18 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
* In device-mapper, we specify things in sectors, but
* MD records this value in kB
*/
value /= 2;
if (value > COUNTER_MAX) {
if (value < 0 || value / 2 > COUNTER_MAX) {
rs->ti->error = "Max write-behind limit out of range";
return -EINVAL;
}
rs->md.bitmap_info.max_write_behind = value;
rs->md.bitmap_info.max_write_behind = value / 2;
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
rs->ti->error = "Only one daemon_sleep argument pair allowed";
return -EINVAL;
}
if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
if (value < 0) {
rs->ti->error = "daemon sleep period out of range";
return -EINVAL;
}
@ -1424,27 +1423,33 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
return -EINVAL;
}
if (value < 0) {
rs->ti->error = "Bogus stripe cache entries value";
return -EINVAL;
}
rs->stripe_cache_entries = value;
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
rs->ti->error = "Only one min_recovery_rate argument pair allowed";
return -EINVAL;
}
if (value > INT_MAX) {
if (value < 0) {
rs->ti->error = "min_recovery_rate out of range";
return -EINVAL;
}
rs->md.sync_speed_min = (int)value;
rs->md.sync_speed_min = value;
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
rs->ti->error = "Only one max_recovery_rate argument pair allowed";
return -EINVAL;
}
if (value > INT_MAX) {
if (value < 0) {
rs->ti->error = "max_recovery_rate out of range";
return -EINVAL;
}
rs->md.sync_speed_max = (int)value;
rs->md.sync_speed_max = value;
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
rs->ti->error = "Only one region_size argument pair allowed";
@ -1490,6 +1495,12 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
return -EINVAL;
}
if (rs->md.sync_speed_max &&
rs->md.sync_speed_min > rs->md.sync_speed_max) {
rs->ti->error = "Bogus recovery rates";
return -EINVAL;
}
if (validate_region_size(rs, region_size))
return -EINVAL;