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dm raid: fix a couple integer overflows 

My static checker complains that if "num_raid_params" is UINT_MAX then
the "if (num_raid_params + 1 > argc) {" check doesn't work as intended.

The other change is that I moved the "if (argc != (num_raid_devs * 2))"
condition forward a few lines so it was before the call to
context_alloc().  If we had an integer overflow inside that function
then it would lead to an immediate crash.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Dan Carpenter 2014-05-29 11:23:23 +03:00 committed by Mike Snitzer
parent 65803c2059
commit 3ca5a21a9c
1 changed files with 7 additions and 9 deletions
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16
drivers/md/dm-raid.c
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@ -1243,7 +1243,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
argv++;
/* Skip over RAID params for now and find out # of devices */
if (num_raid_params + 1 > argc) {
if (num_raid_params >= argc) {
ti->error = "Arguments do not agree with counts given";
return -EINVAL;
}
@ -1254,6 +1254,12 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
return -EINVAL;
}
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
return -EINVAL;
}
rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
if (IS_ERR(rs))
return PTR_ERR(rs);
@ -1262,16 +1268,8 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
if (ret)
goto bad;
ret = -EINVAL;
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
argv += num_raid_params + 1;
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
goto bad;
}
ret = dev_parms(rs, argv);
if (ret)
goto bad;