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[block] Quell spurious Coverity size mismatch warning 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2017-03-22 11:45:28 +02:00
parent c26c1fd07c
commit e846bd22c3
1 changed files with 10 additions and 6 deletions
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16
src/core/sanboot.c
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@ -466,7 +466,10 @@ static int sandev_parse_iso9660 ( struct san_device *sandev ) {
.type = ISO9660_TYPE_PRIMARY,
.id = ISO9660_ID,
};
struct iso9660_primary_descriptor *primary;
union {
struct iso9660_primary_descriptor primary;
char bytes[ISO9660_BLKSIZE];
} *scratch;
unsigned int blksize;
unsigned int blksize_shift;
unsigned int lba;
@ -489,14 +492,14 @@ static int sandev_parse_iso9660 ( struct san_device *sandev ) {
count = ( 1 << blksize_shift );
/* Allocate scratch area */
primary = malloc ( ISO9660_BLKSIZE );
if ( ! primary ) {
scratch = malloc ( ISO9660_BLKSIZE );
if ( ! scratch ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Read primary volume descriptor */
if ( ( rc = sandev_rw ( sandev, lba, count, virt_to_user ( primary ),
if ( ( rc = sandev_rw ( sandev, lba, count, virt_to_user ( scratch ),
block_read ) ) != 0 ) {
DBGC ( sandev, "SAN %#02x could not read ISO9660 primary"
"volume descriptor: %s\n",
@ -505,7 +508,8 @@ static int sandev_parse_iso9660 ( struct san_device *sandev ) {
}
/* Configure as CD-ROM if applicable */
if ( memcmp ( primary, &primary_check, sizeof ( primary_check ) ) == 0){
if ( memcmp ( &scratch->primary.fixed, &primary_check,
sizeof ( primary_check ) ) == 0 ) {
DBGC ( sandev, "SAN %#02x contains an ISO9660 filesystem; "
"treating as CD-ROM\n", sandev->drive );
sandev->blksize_shift = blksize_shift;
@ -513,7 +517,7 @@ static int sandev_parse_iso9660 ( struct san_device *sandev ) {
}
err_rw:
free ( primary );
free ( scratch );
err_alloc:
invalid_blksize:
return rc;