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Diffstat (limited to 'block/qcow.c')
-rw-r--r--block/qcow.c56
1 files changed, 37 insertions, 19 deletions
diff --git a/block/qcow.c b/block/qcow.c
index b16955d764..e0d0b8870e 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -95,11 +95,13 @@ static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
static int qcow_open(BlockDriverState *bs, int flags)
{
BDRVQcowState *s = bs->opaque;
- int len, i, shift;
+ int len, i, shift, ret;
QCowHeader header;
- if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header))
+ ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
+ if (ret < 0) {
goto fail;
+ }
be32_to_cpus(&header.magic);
be32_to_cpus(&header.version);
be64_to_cpus(&header.backing_file_offset);
@@ -109,15 +111,31 @@ static int qcow_open(BlockDriverState *bs, int flags)
be32_to_cpus(&header.crypt_method);
be64_to_cpus(&header.l1_table_offset);
- if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
+ if (header.magic != QCOW_MAGIC) {
+ ret = -EINVAL;
goto fail;
- if (header.size <= 1 || header.cluster_bits < 9)
+ }
+ if (header.version != QCOW_VERSION) {
+ char version[64];
+ snprintf(version, sizeof(version), "QCOW version %d", header.version);
+ qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
+ bs->device_name, "qcow", version);
+ ret = -ENOTSUP;
goto fail;
- if (header.crypt_method > QCOW_CRYPT_AES)
+ }
+
+ if (header.size <= 1 || header.cluster_bits < 9) {
+ ret = -EINVAL;
goto fail;
+ }
+ if (header.crypt_method > QCOW_CRYPT_AES) {
+ ret = -EINVAL;
+ goto fail;
+ }
s->crypt_method_header = header.crypt_method;
- if (s->crypt_method_header)
+ if (s->crypt_method_header) {
bs->encrypted = 1;
+ }
s->cluster_bits = header.cluster_bits;
s->cluster_size = 1 << s->cluster_bits;
s->cluster_sectors = 1 << (s->cluster_bits - 9);
@@ -132,33 +150,33 @@ static int qcow_open(BlockDriverState *bs, int flags)
s->l1_table_offset = header.l1_table_offset;
s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t));
- if (!s->l1_table)
- goto fail;
- if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
- s->l1_size * sizeof(uint64_t))
+
+ ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table,
+ s->l1_size * sizeof(uint64_t));
+ if (ret < 0) {
goto fail;
+ }
+
for(i = 0;i < s->l1_size; i++) {
be64_to_cpus(&s->l1_table[i]);
}
/* alloc L2 cache */
s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
- if (!s->l2_cache)
- goto fail;
s->cluster_cache = g_malloc(s->cluster_size);
- if (!s->cluster_cache)
- goto fail;
s->cluster_data = g_malloc(s->cluster_size);
- if (!s->cluster_data)
- goto fail;
s->cluster_cache_offset = -1;
/* read the backing file name */
if (header.backing_file_offset != 0) {
len = header.backing_file_size;
- if (len > 1023)
+ if (len > 1023) {
len = 1023;
- if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
+ }
+ ret = bdrv_pread(bs->file, header.backing_file_offset,
+ bs->backing_file, len);
+ if (ret < 0) {
goto fail;
+ }
bs->backing_file[len] = '\0';
}
@@ -176,7 +194,7 @@ static int qcow_open(BlockDriverState *bs, int flags)
g_free(s->l2_cache);
g_free(s->cluster_cache);
g_free(s->cluster_data);
- return -1;
+ return ret;
}
static int qcow_set_key(BlockDriverState *bs, const char *key)