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dump: Fix build with newer gcc

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gcc 8 on rawhide is picky enough to complain:

/home/dummy/qemu/dump.c: In function 'create_header32':
/home/dummy/qemu/dump.c:817:5: error: 'strncpy' output truncated before terminating nul copying 8 bytes from a string of the same length [-Werror=stringop-truncation]
     strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

But we already have SIG_LEN defined as the right length without needing
to do a strlen(), and memcpy() is better than strncpy() when we know
we do not want a trailing NUL byte.

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2018-03-27 15:21:51 -05:00 committed by Paolo Bonzini
parent 01366ef9a4
commit 84c868f6b8
1 changed files with 2 additions and 2 deletions
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dump.c
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@ -814,7 +814,7 @@ static void create_header32(DumpState *s, Error **errp)
size = sizeof(DiskDumpHeader32);
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN);
dh->header_version = cpu_to_dump32(s, 6);
block_size = s->dump_info.page_size;
dh->block_size = cpu_to_dump32(s, block_size);
@ -926,7 +926,7 @@ static void create_header64(DumpState *s, Error **errp)
size = sizeof(DiskDumpHeader64);
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN);
dh->header_version = cpu_to_dump32(s, 6);
block_size = s->dump_info.page_size;
dh->block_size = cpu_to_dump32(s, block_size);