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um: remove uses of variable length arrays

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While the affected code is run in user-mode, the build still warns
about it. Convert all uses of VLA to dynamic allocations.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Bartosz Golaszewski 2019-04-11 11:49:42 +02:00 committed by Richard Weinberger
parent 4b6b4c9029
commit 0d4e5ac7e7
1 changed files with 27 additions and 9 deletions
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36
arch/um/os-Linux/umid.c
View file

@ -135,12 +135,18 @@ static int remove_files_and_dir(char *dir)
*/
static inline int is_umdir_used(char *dir)
{
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
char pid[sizeof("nnnnn\0")], *end;
char pid[sizeof("nnnnn\0")], *end, *file;
int dead, fd, p, n, err;
size_t filelen;
n = snprintf(file, sizeof(file), "%s/pid", dir);
if (n >= sizeof(file)) {
err = asprintf(&file, "%s/pid", dir);
if (err < 0)
return 0;
filelen = strlen(file);
n = snprintf(file, filelen, "%s/pid", dir);
if (n >= filelen) {
printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
err = -E2BIG;
goto out;
@ -185,6 +191,7 @@ static inline int is_umdir_used(char *dir)
out_close:
close(fd);
out:
free(file);
return 0;
}
@ -210,18 +217,21 @@ static int umdir_take_if_dead(char *dir)
static void __init create_pid_file(void)
{
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
char pid[sizeof("nnnnn\0")];
char pid[sizeof("nnnnn\0")], *file;
int fd, n;
if (umid_file_name("pid", file, sizeof(file)))
file = malloc(strlen(uml_dir) + UMID_LEN + sizeof("/pid\0"));
if (!file)
return;
if (umid_file_name("pid", file, sizeof(file)))
goto out;
fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
if (fd < 0) {
printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
"%s\n", file, strerror(errno));
return;
goto out;
}
snprintf(pid, sizeof(pid), "%d\n", getpid());
@ -231,6 +241,8 @@ static void __init create_pid_file(void)
errno);
close(fd);
out:
free(file);
}
int __init set_umid(char *name)
@ -385,13 +397,19 @@ __uml_setup("uml_dir=", set_uml_dir,
static void remove_umid_dir(void)
{
char dir[strlen(uml_dir) + UMID_LEN + 1], err;
char *dir, err;
dir = malloc(strlen(uml_dir) + UMID_LEN + 1);
if (!dir)
return;
sprintf(dir, "%s%s", uml_dir, umid);
err = remove_files_and_dir(dir);
if (err)
os_warn("%s - remove_files_and_dir failed with err = %d\n",
__func__, err);
free(dir);
}
__uml_exitcall(remove_umid_dir);