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hwmon: (occ) Fix potential integer overflow 

Cast get_unaligned_be32(...) to u64 in order to give the compiler
complete information about the proper arithmetic to use and avoid
a potential integer overflow.

Notice that such function call is used in contexts that expect
expressions of type u64 (64 bits, unsigned); and the following
expressions are currently being evaluated using 32-bit
arithmetic:

val = get_unaligned_be32(&power->update_tag) *
                        occ->powr_sample_time_us;

val = get_unaligned_be32(&power->vdn.update_tag) *
                        occ->powr_sample_time_us;

Addresses-Coverity-ID: 1442357 ("Unintentional integer overflow")
Addresses-Coverity-ID: 1442476 ("Unintentional integer overflow")
Addresses-Coverity-ID: 1442508 ("Unintentional integer overflow")
Fixes: ff692d80b2e2 ("hwmon (occ): Add sensor types and versions")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Gustavo A. R. Silva 2019-01-07 12:34:31 -06:00 committed by Guenter Roeck
parent 07bd14ccc3
commit b0407d820b
1 changed files with 12 additions and 12 deletions
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24
drivers/hwmon/occ/common.c
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@ -380,8 +380,8 @@ static ssize_t occ_show_power_1(struct device *dev,
val *= 1000000ULL;
break;
case 2:
val = get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->value) * 1000000ULL;
@ -425,8 +425,8 @@ static ssize_t occ_show_power_2(struct device *dev,
&power->update_tag);
break;
case 2:
val = get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->value) * 1000000ULL;
@ -463,8 +463,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
&power->system.update_tag);
break;
case 2:
val = get_unaligned_be32(&power->system.update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->system.update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->system.value) * 1000000ULL;
@ -477,8 +477,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
&power->proc.update_tag);
break;
case 6:
val = get_unaligned_be32(&power->proc.update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->proc.update_tag) *
occ->powr_sample_time_us;
break;
case 7:
val = get_unaligned_be16(&power->proc.value) * 1000000ULL;
@ -491,8 +491,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
&power->vdd.update_tag);
break;
case 10:
val = get_unaligned_be32(&power->vdd.update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->vdd.update_tag) *
occ->powr_sample_time_us;
break;
case 11:
val = get_unaligned_be16(&power->vdd.value) * 1000000ULL;
@ -505,8 +505,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
&power->vdn.update_tag);
break;
case 14:
val = get_unaligned_be32(&power->vdn.update_tag) *
occ->powr_sample_time_us;
val = (u64)get_unaligned_be32(&power->vdn.update_tag) *
occ->powr_sample_time_us;
break;
case 15:
val = get_unaligned_be16(&power->vdn.value) * 1000000ULL;