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| author | Markus Armbruster <armbru@redhat.com> | 2020-12-17 17:19:55 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-12-18 12:42:34 +0100 |
| commit | 02df95c4a1746aac168dc70a6d8aec062e3f6250 (patch) | |
| tree | f6415ca296e20f7dad8a4c680875cfd9daa88ef7 /block/vpc.c | |
| parent | 1a35110150e38beea15865f886022fe329028e12 (diff) | |
| download | qemu-02df95c4a1746aac168dc70a6d8aec062e3f6250.zip qemu-02df95c4a1746aac168dc70a6d8aec062e3f6250.tar.gz qemu-02df95c4a1746aac168dc70a6d8aec062e3f6250.tar.bz2 | |
block/vpc: Make vpc_open() read the full dynamic header
The dynamic header's size is 1024 bytes.
vpc_open() reads only the 512 bytes of the dynamic header into buf[].
Works, because it doesn't actually access the second half. However, a
colleague told me that GCC 11 warns:
../block/vpc.c:358:51: error: array subscript 'struct VHDDynDiskHeader[0]' is partly outside array bounds of 'uint8_t[512]' [-Werror=array-bounds]
Clean up to read the full header.
Rename buf[] to dyndisk_header_buf[] while there.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201217162003.1102738-2-armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/vpc.c')
| -rw-r--r-- | block/vpc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/block/vpc.c b/block/vpc.c index 1ab55f9..2fcf3f6 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -220,7 +220,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, QemuOpts *opts = NULL; Error *local_err = NULL; bool use_chs; - uint8_t buf[HEADER_SIZE]; + uint8_t dyndisk_header_buf[1024]; uint32_t checksum; uint64_t computed_size; uint64_t pagetable_size; @@ -340,14 +340,14 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, } if (disk_type == VHD_DYNAMIC) { - ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, - HEADER_SIZE); + ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), + dyndisk_header_buf, 1024); if (ret < 0) { error_setg(errp, "Error reading dynamic VHD header"); goto fail; } - dyndisk_header = (VHDDynDiskHeader *) buf; + dyndisk_header = (VHDDynDiskHeader *)dyndisk_header_buf; if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { error_setg(errp, "Invalid header magic"); |