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openwrt/target/linux/generic/backport-5.15/423-v6.1-0002-mtd-always-in...

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From e97709c9d18903f5acd5fbe2985dd054da0432b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= <kernel@kempniu.pl>
Date: Wed, 29 Jun 2022 14:57:35 +0200
Subject: [PATCH 2/4] mtd: always initialize 'stats' in struct mtd_oob_ops
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
As the 'stats' field in struct mtd_oob_ops is used in conditional
expressions, ensure it is always zero-initialized in all such structures
to prevent random stack garbage from being interpreted as a pointer.
Strictly speaking, this problem currently only needs to be fixed for
struct mtd_oob_ops structures subsequently passed to mtd_read_oob().
However, this commit goes a step further and makes all instances of
struct mtd_oob_ops in the tree zero-initialized, in hope of preventing
future problems, e.g. if struct mtd_req_stats gets extended with write
statistics at some point.
Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220629125737.14418-3-kernel@kempniu.pl
---
drivers/mtd/inftlcore.c | 6 +++---
drivers/mtd/mtdswap.c | 6 +++---
drivers/mtd/nand/onenand/onenand_base.c | 4 ++--
drivers/mtd/nand/onenand/onenand_bbt.c | 2 +-
drivers/mtd/nand/raw/nand_bbt.c | 8 ++++----
drivers/mtd/nand/raw/sm_common.c | 2 +-
drivers/mtd/nftlcore.c | 6 +++---
drivers/mtd/sm_ftl.c | 4 ++--
drivers/mtd/ssfdc.c | 2 +-
drivers/mtd/tests/nandbiterrs.c | 2 +-
drivers/mtd/tests/oobtest.c | 8 ++++----
drivers/mtd/tests/readtest.c | 2 +-
fs/jffs2/wbuf.c | 6 +++---
13 files changed, 29 insertions(+), 29 deletions(-)
--- a/drivers/mtd/inftlcore.c
+++ b/drivers/mtd/inftlcore.c
@@ -136,7 +136,7 @@ static void inftl_remove_dev(struct mtd_
int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -156,7 +156,7 @@ int inftl_read_oob(struct mtd_info *mtd,
int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -176,7 +176,7 @@ int inftl_write_oob(struct mtd_info *mtd
static int inftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf, uint8_t *oob)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -323,7 +323,7 @@ static int mtdswap_read_markers(struct m
struct mtdswap_oobdata *data, *data2;
int ret;
loff_t offset;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
offset = mtdswap_eb_offset(d, eb);
@@ -370,7 +370,7 @@ static int mtdswap_write_marker(struct m
struct mtdswap_oobdata n;
int ret;
loff_t offset;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.ooboffs = 0;
ops.oobbuf = (uint8_t *)&n;
@@ -879,7 +879,7 @@ static unsigned int mtdswap_eblk_passes(
loff_t base, pos;
unsigned int *p1 = (unsigned int *)d->page_buf;
unsigned char *p2 = (unsigned char *)d->oob_buf;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
ops.mode = MTD_OPS_AUTO_OOB;
--- a/drivers/mtd/nand/onenand/onenand_base.c
+++ b/drivers/mtd/nand/onenand/onenand_base.c
@@ -2935,7 +2935,7 @@ static int do_otp_write(struct mtd_info
struct onenand_chip *this = mtd->priv;
unsigned char *pbuf = buf;
int ret;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
/* Force buffer page aligned */
if (len < mtd->writesize) {
@@ -2977,7 +2977,7 @@ static int do_otp_lock(struct mtd_info *
size_t *retlen, u_char *buf)
{
struct onenand_chip *this = mtd->priv;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
if (FLEXONENAND(this)) {
--- a/drivers/mtd/nand/onenand/onenand_bbt.c
+++ b/drivers/mtd/nand/onenand/onenand_bbt.c
@@ -61,7 +61,7 @@ static int create_bbt(struct mtd_info *m
int startblock;
loff_t from;
size_t readlen, ooblen;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int rgn;
printk(KERN_INFO "Scanning device for bad blocks\n");
--- a/drivers/mtd/nand/raw/nand_bbt.c
+++ b/drivers/mtd/nand/raw/nand_bbt.c
@@ -313,7 +313,7 @@ static int scan_read_oob(struct nand_chi
size_t len)
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res, ret = 0;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -354,7 +354,7 @@ static int scan_write_bbt(struct nand_ch
uint8_t *buf, uint8_t *oob)
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_PLACE_OOB;
ops.ooboffs = 0;
@@ -416,7 +416,7 @@ static int scan_block_fast(struct nand_c
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret, page_offset;
ops.ooblen = mtd->oobsize;
@@ -756,7 +756,7 @@ static int write_bbt(struct nand_chip *t
uint8_t rcode = td->reserved_block_code;
size_t retlen, len = 0;
loff_t to;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.ooblen = mtd->oobsize;
ops.ooboffs = 0;
--- a/drivers/mtd/nand/raw/sm_common.c
+++ b/drivers/mtd/nand/raw/sm_common.c
@@ -99,7 +99,7 @@ static const struct mtd_ooblayout_ops oo
static int sm_block_markbad(struct nand_chip *chip, loff_t ofs)
{
struct mtd_info *mtd = nand_to_mtd(chip);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct sm_oob oob;
int ret;
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -124,7 +124,7 @@ int nftl_read_oob(struct mtd_info *mtd,
size_t *retlen, uint8_t *buf)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -145,7 +145,7 @@ int nftl_write_oob(struct mtd_info *mtd,
size_t *retlen, uint8_t *buf)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -168,7 +168,7 @@ static int nftl_write(struct mtd_info *m
size_t *retlen, uint8_t *buf, uint8_t *oob)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -239,7 +239,7 @@ static int sm_read_sector(struct sm_ftl
uint8_t *buffer, struct sm_oob *oob)
{
struct mtd_info *mtd = ftl->trans->mtd;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct sm_oob tmp_oob;
int ret = -EIO;
int try = 0;
@@ -323,7 +323,7 @@ static int sm_write_sector(struct sm_ftl
int zone, int block, int boffset,
uint8_t *buffer, struct sm_oob *oob)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct mtd_info *mtd = ftl->trans->mtd;
int ret;
--- a/drivers/mtd/ssfdc.c
+++ b/drivers/mtd/ssfdc.c
@@ -163,7 +163,7 @@ static int read_physical_sector(struct m
/* Read redundancy area (wrapper to MTD_READ_OOB */
static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
ops.mode = MTD_OPS_RAW;
--- a/drivers/mtd/tests/nandbiterrs.c
+++ b/drivers/mtd/tests/nandbiterrs.c
@@ -99,7 +99,7 @@ static int write_page(int log)
static int rewrite_page(int log)
{
int err = 0;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
if (log)
pr_info("rewrite page\n");
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -56,7 +56,7 @@ static void do_vary_offset(void)
static int write_eraseblock(int ebnum)
{
int i;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
@@ -165,7 +165,7 @@ static size_t memffshow(loff_t addr, lof
static int verify_eraseblock(int ebnum)
{
int i;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t bitflips;
@@ -260,7 +260,7 @@ static int verify_eraseblock(int ebnum)
static int verify_eraseblock_in_one_go(int ebnum)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t len = mtd->oobavail * pgcnt;
@@ -338,7 +338,7 @@ static int __init mtd_oobtest_init(void)
int err = 0;
unsigned int i;
uint64_t tmp;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
loff_t addr = 0, addr0;
printk(KERN_INFO "\n");
--- a/drivers/mtd/tests/readtest.c
+++ b/drivers/mtd/tests/readtest.c
@@ -47,7 +47,7 @@ static int read_eraseblock_by_page(int e
err = ret;
}
if (mtd->oobsize) {
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_PLACE_OOB;
ops.len = 0;
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1035,7 +1035,7 @@ int jffs2_check_oob_empty(struct jffs2_s
{
int i, ret;
int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_AUTO_OOB;
ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail;
@@ -1076,7 +1076,7 @@ int jffs2_check_oob_empty(struct jffs2_s
int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
ops.mode = MTD_OPS_AUTO_OOB;
@@ -1101,7 +1101,7 @@ int jffs2_write_nand_cleanmarker(struct
struct jffs2_eraseblock *jeb)
{
int ret;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
ops.mode = MTD_OPS_AUTO_OOB;
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