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Fix -Wformat-overflow warning in zfs_project_handle_dir()

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Switch to using asprintf() to satisfy the compiler and resolve the
potential format-overflow warning.  Not the conditional before the
sprintf() would have prevented this regardless.

    cmd/zfs/zfs_project.c: In function ‘zfs_project_handle_dir’:
    cmd/zfs/zfs_project.c:241:38: error: ‘/’ directive writing
    1 byte into a region of size between 0 and 4352
    [-Werror=format-overflow=]
    cmd/zfs/zfs_project.c:241:17: note: ‘sprintf’ output between
    2 and 4609 bytes into a destination of size 4352

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13528
Closes #13575
This commit is contained in:
Brian Behlendorf 2022-06-20 22:27:55 +00:00
parent d483ef3744
commit d2ff2196a5
1 changed files with 10 additions and 4 deletions
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14
cmd/zfs/zfs_project.c
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@ -207,7 +207,6 @@ static int
zfs_project_handle_dir(const char *name, zfs_project_control_t *zpc, zfs_project_handle_dir(const char *name, zfs_project_control_t *zpc,
list_t *head) list_t *head)
{ {
char fullname[PATH_MAX];
struct dirent *ent; struct dirent *ent;
DIR *dir; DIR *dir;
int ret = 0; int ret = 0;
@ -227,21 +226,28 @@ zfs_project_handle_dir(const char *name, zfs_project_control_t *zpc,
zpc->zpc_ignore_noent = B_TRUE; zpc->zpc_ignore_noent = B_TRUE;
errno = 0; errno = 0;
while (!ret && (ent = readdir(dir)) != NULL) { while (!ret && (ent = readdir(dir)) != NULL) {
char *fullname;
/* skip "." and ".." */ /* skip "." and ".." */
if (strcmp(ent->d_name, ".") == 0 || if (strcmp(ent->d_name, ".") == 0 ||
strcmp(ent->d_name, "..") == 0) strcmp(ent->d_name, "..") == 0)
continue; continue;
if (strlen(ent->d_name) + strlen(name) >= if (strlen(ent->d_name) + strlen(name) + 1 >= PATH_MAX) {
sizeof (fullname) + 1) {
errno = ENAMETOOLONG; errno = ENAMETOOLONG;
break; break;
} }
sprintf(fullname, "%s/%s", name, ent->d_name); if (asprintf(&fullname, "%s/%s", name, ent->d_name) == -1) {
errno = ENOMEM;
break;
}
ret = zfs_project_handle_one(fullname, zpc); ret = zfs_project_handle_one(fullname, zpc);
if (!ret && zpc->zpc_recursive && ent->d_type == DT_DIR) if (!ret && zpc->zpc_recursive && ent->d_type == DT_DIR)
zfs_project_item_alloc(head, fullname); zfs_project_item_alloc(head, fullname);
free(fullname);
} }
if (errno && !ret) { if (errno && !ret) {