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block: vmdk - move string allocations from stack to the heap 

Functions 'vmdk_parse_extents' and 'vmdk_create' allocate several
PATH_MAX sized arrays on the stack.  Make these dynamically allocated.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2015-01-22 08:03:26 -05:00 committed by Kevin Wolf
parent 395a22fae0
commit fe2065629a
1 changed files with 23 additions and 16 deletions
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39
block/vmdk.c
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@ -792,12 +792,11 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
const char *p = desc;
int64_t sectors = 0;
int64_t flat_offset;
char extent_path[PATH_MAX];
char *extent_path;
BlockDriverState *extent_file;
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent;
while (*p) {
/* parse extent line in one of below formats:
*
@ -843,11 +842,13 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
return -EINVAL;
}
extent_path = g_malloc0(PATH_MAX);
path_combine(extent_path, sizeof(extent_path),
desc_file_path, fname);
extent_file = NULL;
ret = bdrv_open(&extent_file, extent_path, NULL, NULL,
bs->open_flags | BDRV_O_PROTOCOL, NULL, errp);
g_free(extent_path);
if (ret) {
return ret;
}
@ -1797,10 +1798,15 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
int ret = 0;
bool flat, split, compress;
GString *ext_desc_lines;
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
char *path = g_malloc0(PATH_MAX);
char *prefix = g_malloc0(PATH_MAX);
char *postfix = g_malloc0(PATH_MAX);
char *desc_line = g_malloc0(BUF_SIZE);
char *ext_filename = g_malloc0(PATH_MAX);
char *desc_filename = g_malloc0(PATH_MAX);
const int64_t split_size = 0x80000000; /* VMDK has constant split size */
const char *desc_extent_line;
char parent_desc_line[BUF_SIZE] = "";
char *parent_desc_line = g_malloc0(BUF_SIZE);
uint32_t parent_cid = 0xffffffff;
uint32_t number_heads = 16;
bool zeroed_grain = false;
@ -1916,33 +1922,27 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
}
parent_cid = vmdk_read_cid(bs, 0);
bdrv_unref(bs);
snprintf(parent_desc_line, sizeof(parent_desc_line),
snprintf(parent_desc_line, BUF_SIZE,
"parentFileNameHint=\"%s\"", backing_file);
}
/* Create extents */
filesize = total_size;
while (filesize > 0) {
char desc_line[BUF_SIZE];
char ext_filename[PATH_MAX];
char desc_filename[PATH_MAX];
int64_t size = filesize;
if (split && size > split_size) {
size = split_size;
}
if (split) {
snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s",
snprintf(desc_filename, PATH_MAX, "%s-%c%03d%s",
prefix, flat ? 'f' : 's', ++idx, postfix);
} else if (flat) {
snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s",
prefix, postfix);
snprintf(desc_filename, PATH_MAX, "%s-flat%s", prefix, postfix);
} else {
snprintf(desc_filename, sizeof(desc_filename), "%s%s",
prefix, postfix);
snprintf(desc_filename, PATH_MAX, "%s%s", prefix, postfix);
}
snprintf(ext_filename, sizeof(ext_filename), "%s%s",
path, desc_filename);
snprintf(ext_filename, PATH_MAX, "%s%s", path, desc_filename);
if (vmdk_create_extent(ext_filename, size,
flat, compress, zeroed_grain, opts, errp)) {
@ -1952,7 +1952,7 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
filesize -= size;
/* Format description line */
snprintf(desc_line, sizeof(desc_line),
snprintf(desc_line, BUF_SIZE,
desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename);
g_string_append(ext_desc_lines, desc_line);
}
@ -2007,6 +2007,13 @@ exit:
g_free(backing_file);
g_free(fmt);
g_free(desc);
g_free(path);
g_free(prefix);
g_free(postfix);
g_free(desc_line);
g_free(ext_filename);
g_free(desc_filename);
g_free(parent_desc_line);
g_string_free(ext_desc_lines, true);
return ret;
}