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cloop: Fix bdrv_open() error handling 

Return -errno instead of -1 on errors. While touching the
code, fix a memory leak.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2013-01-25 17:07:28 +01:00 committed by Stefan Hajnoczi
parent 5b7d7dfd19
commit 1a60657f57
1 changed files with 19 additions and 10 deletions
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29
block/cloop.c
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@ -57,27 +57,32 @@ static int cloop_open(BlockDriverState *bs, int flags)
{
BDRVCloopState *s = bs->opaque;
uint32_t offsets_size, max_compressed_block_size = 1, i;
int ret;
bs->read_only = 1;
/* read header */
if (bdrv_pread(bs->file, 128, &s->block_size, 4) < 4) {
goto cloop_close;
ret = bdrv_pread(bs->file, 128, &s->block_size, 4);
if (ret < 0) {
return ret;
}
s->block_size = be32_to_cpu(s->block_size);
if (bdrv_pread(bs->file, 128 + 4, &s->n_blocks, 4) < 4) {
goto cloop_close;
ret = bdrv_pread(bs->file, 128 + 4, &s->n_blocks, 4);
if (ret < 0) {
return ret;
}
s->n_blocks = be32_to_cpu(s->n_blocks);
/* read offsets */
offsets_size = s->n_blocks * sizeof(uint64_t);
s->offsets = g_malloc(offsets_size);
if (bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size) <
offsets_size) {
goto cloop_close;
ret = bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size);
if (ret < 0) {
goto fail;
}
for(i=0;i<s->n_blocks;i++) {
s->offsets[i] = be64_to_cpu(s->offsets[i]);
if (i > 0) {
@ -92,7 +97,8 @@ static int cloop_open(BlockDriverState *bs, int flags)
s->compressed_block = g_malloc(max_compressed_block_size + 1);
s->uncompressed_block = g_malloc(s->block_size);
if (inflateInit(&s->zstream) != Z_OK) {
goto cloop_close;
ret = -EINVAL;
goto fail;
}
s->current_block = s->n_blocks;
@ -101,8 +107,11 @@ static int cloop_open(BlockDriverState *bs, int flags)
qemu_co_mutex_init(&s->lock);
return 0;
cloop_close:
return -1;
fail:
g_free(s->offsets);
g_free(s->compressed_block);
g_free(s->uncompressed_block);
return ret;
}
static inline int cloop_read_block(BlockDriverState *bs, int block_num)