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authorKevin Wolf <kwolf@redhat.com>2013-01-25 17:07:29 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-02-01 14:58:28 +0100
commit59294e465953ffb07d42dc61c827bb98cc0ca423 (patch)
tree0f428d59372759dab65c46a1cb1371ceffbb1516
parent1a60657f5729bac57e70802eb17e67ad793400fd (diff)
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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>
-rw-r--r--block/vpc.c42
1 files changed, 30 insertions, 12 deletions
diff --git a/block/vpc.c b/block/vpc.c
index 7948609..82229ef 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -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,