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author | John Snow <jsnow@redhat.com> | 2016-02-05 13:12:33 -0500 |
---|---|---|
committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-11-29 19:45:30 -0600 |
commit | 146d39904751bc35d9a7b34d8dd36d8336a10f1c (patch) | |
tree | 5db74a1c792cb3376ee1eead0d23478b266d283e | |
parent | 800a4b7f91a7ccd24d4ff22550392349eb54b583 (diff) | |
download | hqemu-146d39904751bc35d9a7b34d8dd36d8336a10f1c.zip hqemu-146d39904751bc35d9a7b34d8dd36d8336a10f1c.tar.gz |
qemu-img: initialize MapEntry object
Commit 16b0d555 introduced an issue where we are not initializing
has_filename for the 'next' MapEntry object, which leads to interesting
errors in both Valgrind and Clang -fsanitize=undefined.
Zero the stack object at allocation AND make sure the utility to
populate the fields properly marks has_filename as false if applicable.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
-rw-r--r-- | qemu-img.c | 26 |
1 files changed, 15 insertions, 11 deletions
@@ -2194,6 +2194,7 @@ static int get_block_status(BlockDriverState *bs, int64_t sector_num, int64_t ret; int depth; BlockDriverState *file; + bool has_offset; /* As an optimization, we could cache the current range of unallocated * clusters in each file of the chain, and avoid querying the same @@ -2220,17 +2221,20 @@ static int get_block_status(BlockDriverState *bs, int64_t sector_num, depth++; } - e->start = sector_num * BDRV_SECTOR_SIZE; - e->length = nb_sectors * BDRV_SECTOR_SIZE; - e->data = !!(ret & BDRV_BLOCK_DATA); - e->zero = !!(ret & BDRV_BLOCK_ZERO); - e->offset = ret & BDRV_BLOCK_OFFSET_MASK; - e->has_offset = !!(ret & BDRV_BLOCK_OFFSET_VALID); - e->depth = depth; - if (file && e->has_offset) { - e->has_filename = true; - e->filename = file->filename; - } + has_offset = !!(ret & BDRV_BLOCK_OFFSET_VALID); + + *e = (MapEntry) { + .start = sector_num * BDRV_SECTOR_SIZE, + .length = nb_sectors * BDRV_SECTOR_SIZE, + .data = !!(ret & BDRV_BLOCK_DATA), + .zero = !!(ret & BDRV_BLOCK_ZERO), + .offset = ret & BDRV_BLOCK_OFFSET_MASK, + .has_offset = has_offset, + .depth = depth, + .has_filename = file && has_offset, + .filename = file && has_offset ? file->filename : NULL, + }; + return 0; } |