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kernel: fix mtd partition erase < parent_erasesize writes 

This bug applied where mtd partition end address,
or erase start address, was not cleanly divisible by parent mtd erasesize.

This error would cause the bits following the end of the partition
to the next erasesize block boundary to be erased,
and this partition-overflow data to be written to the partition erase
address (missing additional partition offset address)
of the mtd (top) parent device.

Fixes: FS#2428

Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
Tested-by: Tomasz Maciej Nowak <tomek_n@o2.pl>
[shorten commit title, add Fixes, fix kernel 4.19 as well]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
master
John Thomson 2020-08-06 07:13:54 +10:00 committed by Adrian Schmutzler
parent 8cfb839907
commit bf2870c1d9
4 changed files with 14 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch
View File

@ -19,7 +19,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);
@@ -220,6 +222,53 @@ static int part_erase(struct mtd_info *m
@@ -220,11 +222,77 @@ static int part_erase(struct mtd_info *m
{
struct mtd_part *part = mtd_to_part(mtd);
int ret;
@ -73,10 +73,9 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
instr->addr += part->offset;
ret = part->parent->_erase(part->parent, instr);
@@ -227,6 +276,24 @@ static int part_erase(struct mtd_info *m
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
+
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
+ if (partial_start) {
+ part->parent->_write(part->parent,
@ -95,10 +94,10 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ kfree(erase_buf);
+ }
+
return ret;
}
instr->addr -= part->offset;
@@ -539,19 +606,22 @@ static struct mtd_part *allocate_partiti
return ret;
@@ -539,19 +607,22 @@ static struct mtd_part *allocate_partiti
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
/* Doesn't start on a boundary of major erase size */

2
target/linux/generic/pending-4.19/412-mtd-partial_eraseblock_unlock.patch
View File

@ -20,7 +20,7 @@ Signed-off-by: Tim Harvey <tharvey@gateworks.com>
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -306,7 +306,16 @@ static int part_lock(struct mtd_info *mt
@@ -307,7 +307,16 @@ static int part_lock(struct mtd_info *mt
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);

13
target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch
View File

@ -19,7 +19,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);
@@ -206,6 +208,53 @@ static int part_erase(struct mtd_info *m
@@ -206,11 +208,77 @@ static int part_erase(struct mtd_info *m
{
struct mtd_part *part = mtd_to_part(mtd);
int ret;
@ -73,10 +73,9 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
instr->addr += part->offset;
ret = part->parent->_erase(part->parent, instr);
@@ -213,6 +262,24 @@ static int part_erase(struct mtd_info *m
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
+
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
+ if (partial_start) {
+ part->parent->_write(part->parent,
@ -95,10 +94,10 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ kfree(erase_buf);
+ }
+
return ret;
}
instr->addr -= part->offset;
@@ -525,19 +592,22 @@ static struct mtd_part *allocate_partiti
return ret;
@@ -525,19 +593,22 @@ static struct mtd_part *allocate_partiti
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
/* Doesn't start on a boundary of major erase size */

2
target/linux/generic/pending-5.4/412-mtd-partial_eraseblock_unlock.patch
View File

@ -20,7 +20,7 @@ Signed-off-by: Tim Harvey <tharvey@gateworks.com>
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -292,7 +292,16 @@ static int part_lock(struct mtd_info *mt
@@ -293,7 +293,16 @@ static int part_lock(struct mtd_info *mt
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);