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Wed, 30 Sep 2020 15:59:00 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 30 Sep 2020 15:59:00 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 25651) id 9B787E1FB0; Wed, 30 Sep 2020 17:59:00 +0200 (CEST) From: Christian Borntraeger To: qemu-devel@nongnu.org Subject: [PATCH 1/4] vmdk: fix maybe uninitialized warnings Date: Wed, 30 Sep 2020 17:58:56 +0200 Message-Id: <20200930155859.303148-2-borntraeger@de.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200930155859.303148-1-borntraeger@de.ibm.com> References: <20200930155859.303148-1-borntraeger@de.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-30_08:2020-09-30, 2020-09-30 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 spamscore=0 malwarescore=0 clxscore=1015 adultscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 suspectscore=4 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009300124 Received-SPF: pass client-ip=148.163.156.1; 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David Alan Gilbert" , Max Reitz , Christian Borntraeger , Stefan Hajnoczi Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.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;