diff options
| author | Jeff Cody <jcody@redhat.com> | 2015-01-22 08:03:30 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-01-23 18:17:06 +0100 |
| commit | 9a29e18f7dfd5a0e80d1c60fc856ebba18ddb738 (patch) | |
| tree | e9c2bf9ca98de347124834109e8bdee2b3859004 /block | |
| parent | 1d33936ea847693a6d69f9049691a0341d6e0b9f (diff) | |
block: update string sizes for filename,backing_file,exact_filename
The string field entries 'filename', 'backing_file', and
'exact_filename' in the BlockDriverState struct are defined as 1024
bytes.
However, many places that use these values accept a maximum of PATH_MAX
bytes, so we have a mixture of 1024 byte and PATH_MAX byte allocations.
This patch makes the BlockDriverStruct field string sizes match usage.
This patch also does a few fixes related to the size that needs to
happen now:
* the block qapi driver is updated to use PATH_MAX bytes
* the qcow and qcow2 drivers have an additional safety check
* the block vvfat driver is updated to use PATH_MAX bytes
for the size of backing_file, for systems where PATH_MAX is < 1024
bytes.
* qemu-img uses PATH_MAX rather than 1024. These instances were not
changed to be dynamically allocated, however, as the extra
temporary 3K in stack usage for qemu-img does not seem worrisome.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/qapi.c | 4 | ||||
| -rw-r--r-- | block/qcow.c | 2 | ||||
| -rw-r--r-- | block/qcow2.c | 3 | ||||
| -rw-r--r-- | block/vvfat.c | 4 |
4 files changed, 7 insertions, 6 deletions
diff --git a/block/qapi.c b/block/qapi.c index dec9f60d10..75c388e90b 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -210,10 +210,10 @@ void bdrv_query_image_info(BlockDriverState *bs, backing_filename = bs->backing_file; if (backing_filename[0] != '\0') { - char *backing_filename2 = g_malloc0(1024); + char *backing_filename2 = g_malloc0(PATH_MAX); info->backing_filename = g_strdup(backing_filename); info->has_backing_filename = true; - bdrv_get_full_backing_filename(bs, backing_filename2, 1024, &err); + bdrv_get_full_backing_filename(bs, backing_filename2, PATH_MAX, &err); if (err) { error_propagate(errp, err); qapi_free_ImageInfo(info); diff --git a/block/qcow.c b/block/qcow.c index ece22697a6..ccbe9e0d2c 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -215,7 +215,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags, /* read the backing file name */ if (header.backing_file_offset != 0) { len = header.backing_file_size; - if (len > 1023) { + if (len > 1023 || len > sizeof(bs->backing_file)) { error_setg(errp, "Backing file name too long"); ret = -EINVAL; goto fail; diff --git a/block/qcow2.c b/block/qcow2.c index e4e690a42b..dbaf016bc7 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -868,7 +868,8 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, /* read the backing file name */ if (header.backing_file_offset != 0) { len = header.backing_file_size; - if (len > MIN(1023, s->cluster_size - header.backing_file_offset)) { + if (len > MIN(1023, s->cluster_size - header.backing_file_offset) || + len > sizeof(bs->backing_file)) { error_setg(errp, "Backing file name too long"); ret = -EINVAL; goto fail; diff --git a/block/vvfat.c b/block/vvfat.c index e34a789699..a1a44f0ef5 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -2909,8 +2909,8 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp) array_init(&(s->commits), sizeof(commit_t)); - s->qcow_filename = g_malloc(1024); - ret = get_tmp_filename(s->qcow_filename, 1024); + s->qcow_filename = g_malloc(PATH_MAX); + ret = get_tmp_filename(s->qcow_filename, PATH_MAX); if (ret < 0) { error_setg_errno(errp, -ret, "can't create temporary file"); goto err; |