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vmdk: fix maybe uninitialized warnings 

Fedora 32 gcc 10 seems to give false positives:

Compiling C object libblock.fa.p/block_vmdk.c.o
../block/vmdk.c: In function ‘vmdk_parse_extents’:
../block/vmdk.c:587:5: error: ‘extent’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  587 |     g_free(extent->l1_table);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
../block/vmdk.c:754:17: note: ‘extent’ was declared here
  754 |     VmdkExtent *extent;
      |                 ^~~~~~
../block/vmdk.c:620:11: error: ‘extent’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  620 |     ret = vmdk_init_tables(bs, extent, errp);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../block/vmdk.c:598:17: note: ‘extent’ was declared here
  598 |     VmdkExtent *extent;
      |                 ^~~~~~
../block/vmdk.c:1178:39: error: ‘extent’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1178 |             extent->flat_start_offset = flat_offset << 9;
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
../block/vmdk.c: In function ‘vmdk_open_vmdk4’:
../block/vmdk.c:581:22: error: ‘extent’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  581 |     extent->l2_cache =
      |     ~~~~~~~~~~~~~~~~~^
  582 |         g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE);
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../block/vmdk.c:872:17: note: ‘extent’ was declared here
  872 |     VmdkExtent *extent;
      |                 ^~~~~~
../block/vmdk.c: In function ‘vmdk_open’:
../block/vmdk.c:620:11: error: ‘extent’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  620 |     ret = vmdk_init_tables(bs, extent, errp);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../block/vmdk.c:598:17: note: ‘extent’ was declared here
  598 |     VmdkExtent *extent;
      |                 ^~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile.ninja:884: libblock.fa.p/block_vmdk.c.o] Error 1

fix them by assigning a default value.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Fam Zheng <fam@euphon.net>
Message-Id: <20200930155859.303148-2-borntraeger@de.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Christian Borntraeger 2020-09-30 17:58:56 +02:00 committed by Laurent Vivier
parent ff82a54bc4
commit cd466702f0
1 changed files with 4 additions and 4 deletions
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8
block/vmdk.c
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@ -595,7 +595,7 @@ static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
int ret;
uint32_t magic;
VMDK3Header header;
VmdkExtent *extent;
VmdkExtent *extent = NULL;
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
@ -751,7 +751,7 @@ static int vmdk_open_se_sparse(BlockDriverState *bs,
int ret;
VMDKSESparseConstHeader const_header;
VMDKSESparseVolatileHeader volatile_header;
VmdkExtent *extent;
VmdkExtent *extent = NULL;
ret = bdrv_apply_auto_read_only(bs,
"No write support for seSparse images available", errp);
@ -869,7 +869,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
uint32_t magic;
uint32_t l1_size, l1_entry_sectors;
VMDK4Header header;
VmdkExtent *extent;
VmdkExtent *extent = NULL;
BDRVVmdkState *s = bs->opaque;
int64_t l1_backup_offset = 0;
bool compressed;
@ -1088,7 +1088,7 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
BdrvChild *extent_file;
BdrvChildRole extent_role;
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent;
VmdkExtent *extent = NULL;
char extent_opt_prefix[32];
Error *local_err = NULL;