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David Alan Gilbert" , Max Reitz , Christian Borntraeger , Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 Reviewed-by: Fam Zheng --- block/vmdk.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/block/vmdk.c b/block/vmdk.c index 8ec62c7ab798..a00dc00eb47a 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -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;