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vpc: Fix bdrv_open() error handling 

Return -errno instead of -1 on errors. While touching the
code, fix a memory leak.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2013-01-25 17:07:29 +01:00 committed by Stefan Hajnoczi
parent 1a60657f57
commit 59294e4659
1 changed files with 30 additions and 12 deletions
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42
block/vpc.c
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@ -163,24 +163,33 @@ static int vpc_open(BlockDriverState *bs, int flags)
struct vhd_dyndisk_header* dyndisk_header;
uint8_t buf[HEADER_SIZE];
uint32_t checksum;
int err = -1;
int disk_type = VHD_DYNAMIC;
int ret;
if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE);
if (ret < 0) {
goto fail;
}
footer = (struct vhd_footer*) s->footer_buf;
if (strncmp(footer->creator, "conectix", 8)) {
int64_t offset = bdrv_getlength(bs->file);
if (offset < HEADER_SIZE) {
if (offset < 0) {
ret = offset;
goto fail;
} else if (offset < HEADER_SIZE) {
ret = -EINVAL;
goto fail;
}
/* If a fixed disk, the footer is found only at the end of the file */
if (bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE)
!= HEADER_SIZE) {
ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf,
HEADER_SIZE);
if (ret < 0) {
goto fail;
}
if (strncmp(footer->creator, "conectix", 8)) {
ret = -EMEDIUMTYPE;
goto fail;
}
disk_type = VHD_FIXED;
@ -203,19 +212,21 @@ static int vpc_open(BlockDriverState *bs, int flags)
/* Allow a maximum disk size of approximately 2 TB */
if (bs->total_sectors >= 65535LL * 255 * 255) {
err = -EFBIG;
ret = -EFBIG;
goto fail;
}
if (disk_type == VHD_DYNAMIC) {
if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
HEADER_SIZE) != HEADER_SIZE) {
ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
HEADER_SIZE);
if (ret < 0) {
goto fail;
}
dyndisk_header = (struct vhd_dyndisk_header *) buf;
if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
ret = -EINVAL;
goto fail;
}
@ -226,8 +237,10 @@ static int vpc_open(BlockDriverState *bs, int flags)
s->pagetable = g_malloc(s->max_table_entries * 4);
s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
s->max_table_entries * 4) != s->max_table_entries * 4) {
ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable,
s->max_table_entries * 4);
if (ret < 0) {
goto fail;
}
@ -265,8 +278,13 @@ static int vpc_open(BlockDriverState *bs, int flags)
migrate_add_blocker(s->migration_blocker);
return 0;
fail:
return err;
fail:
g_free(s->pagetable);
#ifdef CACHE
g_free(s->pageentry_u8);
#endif
return ret;
}
static int vpc_reopen_prepare(BDRVReopenState *state,