mtd: tests: fix integer overflow issues
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Wed Oct 15 23:59:03 PDT 2014
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=1001ff7a4f64f3f4264e69d3ed70ff428f627e01
Commit: 1001ff7a4f64f3f4264e69d3ed70ff428f627e01
Parent: 8c3f3f1d7941bcb25590b784f84accd7dcb44ba3
Author: Brian Norris <computersforpeace at gmail.com>
AuthorDate: Mon Jul 21 19:07:12 2014 -0700
Committer: Brian Norris <computersforpeace at gmail.com>
CommitDate: Tue Aug 19 11:53:08 2014 -0700
mtd: tests: fix integer overflow issues
These multiplications are done with 32-bit arithmetic, then converted to
64-bit. We should widen the integers first to prevent overflow. This
could be a problem for large (>4GB) MTD's.
Detected by Coverity.
Signed-off-by: Brian Norris <computersforpeace at gmail.com>
Cc: Akinobu Mita <akinobu.mita at gmail.com>
---
drivers/mtd/tests/mtd_test.c | 4 ++--
drivers/mtd/tests/nandbiterrs.c | 2 +-
drivers/mtd/tests/oobtest.c | 8 ++++----
drivers/mtd/tests/pagetest.c | 4 ++--
drivers/mtd/tests/readtest.c | 2 +-
drivers/mtd/tests/speedtest.c | 14 +++++++-------
drivers/mtd/tests/subpagetest.c | 10 +++++-----
7 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/drivers/mtd/tests/mtd_test.c b/drivers/mtd/tests/mtd_test.c
index 111ee46..34736bb 100644
--- a/drivers/mtd/tests/mtd_test.c
+++ b/drivers/mtd/tests/mtd_test.c
@@ -10,7 +10,7 @@ int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)
{
int err;
struct erase_info ei;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
memset(&ei, 0, sizeof(struct erase_info));
ei.mtd = mtd;
@@ -33,7 +33,7 @@ int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)
static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
{
int ret;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
ret = mtd_block_isbad(mtd, addr);
if (ret)
diff --git a/drivers/mtd/tests/nandbiterrs.c b/drivers/mtd/tests/nandbiterrs.c
index 6f97615..273f7e5 100644
--- a/drivers/mtd/tests/nandbiterrs.c
+++ b/drivers/mtd/tests/nandbiterrs.c
@@ -364,7 +364,7 @@ static int __init mtd_nandbiterrs_init(void)
pr_info("Device uses %d subpages of %d bytes\n", subcount, subsize);
- offset = page_offset * mtd->writesize;
+ offset = (loff_t)page_offset * mtd->writesize;
eraseblock = mtd_div_by_eb(offset, mtd);
pr_info("Using page=%u, offset=%llu, eraseblock=%u\n",
diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index f19ab1a..dc4f960 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -120,7 +120,7 @@ static int verify_eraseblock(int ebnum)
int i;
struct mtd_oob_ops ops;
int err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
@@ -214,7 +214,7 @@ static int verify_eraseblock_in_one_go(int ebnum)
{
struct mtd_oob_ops ops;
int err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t len = mtd->ecclayout->oobavail * pgcnt;
prandom_bytes_state(&rnd_state, writebuf, len);
@@ -568,7 +568,7 @@ static int __init mtd_oobtest_init(void)
size_t sz = mtd->ecclayout->oobavail;
if (bbt[i] || bbt[i + 1])
continue;
- addr = (i + 1) * mtd->erasesize - mtd->writesize;
+ addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
prandom_bytes_state(&rnd_state, writebuf, sz * cnt);
for (pg = 0; pg < cnt; ++pg) {
ops.mode = MTD_OPS_AUTO_OOB;
@@ -598,7 +598,7 @@ static int __init mtd_oobtest_init(void)
continue;
prandom_bytes_state(&rnd_state, writebuf,
mtd->ecclayout->oobavail * 2);
- addr = (i + 1) * mtd->erasesize - mtd->writesize;
+ addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
diff --git a/drivers/mtd/tests/pagetest.c b/drivers/mtd/tests/pagetest.c
index ed2d3f6..88296e8 100644
--- a/drivers/mtd/tests/pagetest.c
+++ b/drivers/mtd/tests/pagetest.c
@@ -52,7 +52,7 @@ static struct rnd_state rnd_state;
static int write_eraseblock(int ebnum)
{
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
cond_resched();
@@ -64,7 +64,7 @@ static int verify_eraseblock(int ebnum)
uint32_t j;
int err = 0, i;
loff_t addr0, addrn;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i)
diff --git a/drivers/mtd/tests/readtest.c b/drivers/mtd/tests/readtest.c
index 626e66d..a54cf15 100644
--- a/drivers/mtd/tests/readtest.c
+++ b/drivers/mtd/tests/readtest.c
@@ -47,7 +47,7 @@ static int pgcnt;
static int read_eraseblock_by_page(int ebnum)
{
int i, ret, err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
void *oobbuf = iobuf1;
diff --git a/drivers/mtd/tests/speedtest.c b/drivers/mtd/tests/speedtest.c
index 87ff6a2..5ee9f70 100644
--- a/drivers/mtd/tests/speedtest.c
+++ b/drivers/mtd/tests/speedtest.c
@@ -55,7 +55,7 @@ static int multiblock_erase(int ebnum, int blocks)
{
int err;
struct erase_info ei;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
memset(&ei, 0, sizeof(struct erase_info));
ei.mtd = mtd;
@@ -80,7 +80,7 @@ static int multiblock_erase(int ebnum, int blocks)
static int write_eraseblock(int ebnum)
{
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
}
@@ -88,7 +88,7 @@ static int write_eraseblock(int ebnum)
static int write_eraseblock_by_page(int ebnum)
{
int i, err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
@@ -106,7 +106,7 @@ static int write_eraseblock_by_2pages(int ebnum)
{
size_t sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
@@ -124,7 +124,7 @@ static int write_eraseblock_by_2pages(int ebnum)
static int read_eraseblock(int ebnum)
{
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
}
@@ -132,7 +132,7 @@ static int read_eraseblock(int ebnum)
static int read_eraseblock_by_page(int ebnum)
{
int i, err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
@@ -150,7 +150,7 @@ static int read_eraseblock_by_2pages(int ebnum)
{
size_t sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
diff --git a/drivers/mtd/tests/subpagetest.c b/drivers/mtd/tests/subpagetest.c
index a876371..7b59ef5 100644
--- a/drivers/mtd/tests/subpagetest.c
+++ b/drivers/mtd/tests/subpagetest.c
@@ -57,7 +57,7 @@ static int write_eraseblock(int ebnum)
{
size_t written;
int err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, subpgsize);
err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
@@ -92,7 +92,7 @@ static int write_eraseblock2(int ebnum)
{
size_t written;
int err = 0, k;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
for (k = 1; k < 33; ++k) {
if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
@@ -131,7 +131,7 @@ static int verify_eraseblock(int ebnum)
{
size_t read;
int err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, subpgsize);
clear_data(readbuf, subpgsize);
@@ -192,7 +192,7 @@ static int verify_eraseblock2(int ebnum)
{
size_t read;
int err = 0, k;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
for (k = 1; k < 33; ++k) {
if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
@@ -227,7 +227,7 @@ static int verify_eraseblock_ff(int ebnum)
uint32_t j;
size_t read;
int err = 0;
- loff_t addr = ebnum * mtd->erasesize;
+ loff_t addr = (loff_t)ebnum * mtd->erasesize;
memset(writebuf, 0xff, subpgsize);
for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
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