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block/qcow2-bitmap: Don't take address of fields in packed structs 

Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by not using the
"modify in place" byte swapping functions.

There are a few places where the in-place swap function is
used on something other than a packed struct field; we convert
those anyway, for consistency.

This patch was produced with the following spatch script:

@@
expression E;
@@
-be16_to_cpus(&E);
+E = be16_to_cpu(E);
@@
expression E;
@@
-be32_to_cpus(&E);
+E = be32_to_cpu(E);
@@
expression E;
@@
-be64_to_cpus(&E);
+E = be64_to_cpu(E);
@@
expression E;
@@
-cpu_to_be16s(&E);
+E = cpu_to_be16(E);
@@
expression E;
@@
-cpu_to_be32s(&E);
+E = cpu_to_be32(E);
@@
expression E;
@@
-cpu_to_be64s(&E);
+E = cpu_to_be64(E);

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: John Snow <jsnow@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Maydell 2018-10-09 18:25:01 +01:00 committed by Kevin Wolf
parent a5fdff18a7
commit caacea4b2e
1 changed files with 12 additions and 12 deletions
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24
block/qcow2-bitmap.c
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@ -118,7 +118,7 @@ static inline void bitmap_table_to_be(uint64_t *bitmap_table, size_t size)
size_t i;
for (i = 0; i < size; ++i) {
cpu_to_be64s(&bitmap_table[i]);
bitmap_table[i] = cpu_to_be64(bitmap_table[i]);
}
}
@ -231,7 +231,7 @@ static int bitmap_table_load(BlockDriverState *bs, Qcow2BitmapTable *tb,
}
for (i = 0; i < tb->size; ++i) {
be64_to_cpus(&table[i]);
table[i] = be64_to_cpu(table[i]);
ret = check_table_entry(table[i], s->cluster_size);
if (ret < 0) {
goto fail;
@ -394,20 +394,20 @@ fail:
static inline void bitmap_dir_entry_to_cpu(Qcow2BitmapDirEntry *entry)
{
be64_to_cpus(&entry->bitmap_table_offset);
be32_to_cpus(&entry->bitmap_table_size);
be32_to_cpus(&entry->flags);
be16_to_cpus(&entry->name_size);
be32_to_cpus(&entry->extra_data_size);
entry->bitmap_table_offset = be64_to_cpu(entry->bitmap_table_offset);
entry->bitmap_table_size = be32_to_cpu(entry->bitmap_table_size);
entry->flags = be32_to_cpu(entry->flags);
entry->name_size = be16_to_cpu(entry->name_size);
entry->extra_data_size = be32_to_cpu(entry->extra_data_size);
}
static inline void bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry)
{
cpu_to_be64s(&entry->bitmap_table_offset);
cpu_to_be32s(&entry->bitmap_table_size);
cpu_to_be32s(&entry->flags);
cpu_to_be16s(&entry->name_size);
cpu_to_be32s(&entry->extra_data_size);
entry->bitmap_table_offset = cpu_to_be64(entry->bitmap_table_offset);
entry->bitmap_table_size = cpu_to_be32(entry->bitmap_table_size);
entry->flags = cpu_to_be32(entry->flags);
entry->name_size = cpu_to_be16(entry->name_size);
entry->extra_data_size = cpu_to_be32(entry->extra_data_size);
}
static inline int calc_dir_entry_size(size_t name_size, size_t extra_data_size)