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mtd: improve check for TRX header being already fixed 

First of all lengths should be compared after checking all blocks for
being good/bad. It's because requested length may differ from a final
one if there were some bad blocks.

Secondly it makes sense to also compare crc32 since we already have a
new one calculated.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 82498a7f7a)
This commit is contained in:
Rafał Miłecki 2018-07-15 23:23:42 +02:00
parent 828eaeee25
commit 79c8f2f50b
2 changed files with 9 additions and 8 deletions
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2
package/system/mtd/Makefile
View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=mtd
PKG_RELEASE:=22$(if $(SDK),,.1)
PKG_RELEASE:=23$(if $(SDK),,.1)
PKG_BUILD_DIR := $(KERNEL_BUILD_DIR)/$(PKG_NAME)
STAMP_PREPARED := $(STAMP_PREPARED)_$(call confvar,CONFIG_MTD_REDBOOT_PARTS)

15
package/system/mtd/src/trx.c
View File

@ -207,13 +207,6 @@ mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
exit(1);
}
if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET)) {
if (quiet < 2)
fprintf(stderr, "Header already fixed, exiting\n");
close(fd);
return 0;
}
buf = malloc(data_size);
if (!buf) {
perror("malloc");
@ -243,6 +236,14 @@ mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
}
data_size = to - buf;
if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET) &&
trx->crc32 == STORE32_LE(crc32buf(buf, data_size))) {
if (quiet < 2)
fprintf(stderr, "Header already fixed, exiting\n");
close(fd);
return 0;
}
trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
trx->crc32 = STORE32_LE(crc32buf(buf, data_size));