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nvramtool: write size field more obviously 

The field wasn't initialized in RAM first and later overwritten in a somewhat
twisted way (that relied on the size field coming after the tag field in the
struct).

Change-Id: Ibe931b297df51e3c46ae163e059338781f5a27e2
Found-by: Coverity Scan
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/4087
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Patrick Georgi 2013-11-11 15:16:53 +01:00 committed by Stefan Reinauer
parent ef4020957e
commit c37b05c413
1 changed files with 4 additions and 2 deletions
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6
util/nvramtool/accessors/layout-bin.c
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@ -112,6 +112,7 @@ int write_cmos_layout_bin(FILE *f)
sum += sizeof(table);
table.header_length = sizeof(table);
table.tag = LB_TAG_CMOS_OPTION_TABLE;
table.size = 0;
if (fwrite((char *)&table, sizeof(table), 1, f) != 1) {
perror("Error writing image file");
@ -187,12 +188,13 @@ int write_cmos_layout_bin(FILE *f)
goto err;
}
if (fseek(f, sizeof(table.tag), SEEK_SET) != 0) {
if (fseek(f, 0, SEEK_SET) != 0) {
perror("Error while seeking");
goto err;
}
if (fwrite((char *)&sum, sizeof(table.tag), 1, f) != 1) {
table.size = sum;
if (fwrite((char *)&table, sizeof(table), 1, f) != 1) {
perror("Error writing image file");
goto err;
}