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media: siano: be sure to not override devpath size

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Right now, at siano driver, all places where devpath is
defined has sizeof(devpath) == 32. So, there's no practical
risc of going past devpath array anywhere.

Still, code changes might cause troubles. It also confuses
Coverity:
	CID 139059 (#1 of 1): Copy into fixed size buffer (STRING_OVERFLOW)
	9. fixed_size_dest: You might overrun the 32-character
	   fixed-size string entry->devpath by copying devpath
	   without checking the length.
	10. parameter_as_source: Note: This defect has an
	    elevated risk because the source argument
	    is a parameter of the current function.

So, explicitly limit strcmp() and strcpy() to ensure that the
devpath size (32) will be respected.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2018-04-23 09:14:30 -04:00 committed by Mauro Carvalho Chehab
parent e1b7f11b37
commit 5ef76cb7c1
1 changed files with 5 additions and 5 deletions
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10
drivers/media/common/siano/smscoreapi.c
View file

@ -415,8 +415,8 @@ EXPORT_SYMBOL_GPL(smscore_get_board_id);
struct smscore_registry_entry_t {
struct list_head entry;
char devpath[32];
int mode;
char devpath[32];
int mode;
enum sms_device_type_st type;
};
@ -442,7 +442,7 @@ static struct smscore_registry_entry_t *smscore_find_registry(char *devpath)
next != &g_smscore_registry;
next = next->next) {
entry = (struct smscore_registry_entry_t *) next;
if (!strcmp(entry->devpath, devpath)) {
if (!strncmp(entry->devpath, devpath, sizeof(entry->devpath))) {
kmutex_unlock(&g_smscore_registrylock);
return entry;
}
@ -450,7 +450,7 @@ static struct smscore_registry_entry_t *smscore_find_registry(char *devpath)
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (entry) {
entry->mode = default_mode;
strcpy(entry->devpath, devpath);
strlcpy(entry->devpath, devpath, sizeof(entry->devpath));
list_add(&entry->entry, &g_smscore_registry);
} else
pr_err("failed to create smscore_registry.\n");
@ -733,7 +733,7 @@ int smscore_register_device(struct smsdevice_params_t *params,
dev->postload_handler = params->postload_handler;
dev->device_flags = params->flags;
strcpy(dev->devpath, params->devpath);
strlcpy(dev->devpath, params->devpath, sizeof(dev->devpath));
smscore_registry_settype(dev->devpath, params->device_type);