diff options
Diffstat (limited to 'drivers/base/firmware_loader/main.c')
| -rw-r--r-- | drivers/base/firmware_loader/main.c | 31 |
1 files changed, 11 insertions, 20 deletions
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 44486b2c7172..6942c62fa59d 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -822,26 +822,6 @@ static void fw_log_firmware_info(const struct firmware *fw, const char *name, {} #endif -/* - * Reject firmware file names with ".." path components. - * There are drivers that construct firmware file names from device-supplied - * strings, and we don't want some device to be able to tell us "I would like to - * be sent my firmware from ../../../etc/shadow, please". - * - * Search for ".." surrounded by either '/' or start/end of string. - * - * This intentionally only looks at the firmware name, not at the firmware base - * directory or at symlink contents. - */ -static bool name_contains_dotdot(const char *name) -{ - size_t name_len = strlen(name); - - return strcmp(name, "..") == 0 || strncmp(name, "../", 3) == 0 || - strstr(name, "/../") != NULL || - (name_len >= 3 && strcmp(name+name_len-3, "/..") == 0); -} - /* called from request_firmware() and request_firmware_work_func() */ static int _request_firmware(const struct firmware **firmware_p, const char *name, @@ -862,6 +842,17 @@ _request_firmware(const struct firmware **firmware_p, const char *name, goto out; } + + /* + * Reject firmware file names with ".." path components. + * There are drivers that construct firmware file names from + * device-supplied strings, and we don't want some device to be + * able to tell us "I would like to be sent my firmware from + * ../../../etc/shadow, please". + * + * This intentionally only looks at the firmware name, not at + * the firmware base directory or at symlink contents. + */ if (name_contains_dotdot(name)) { dev_warn(device, "Firmware load for '%s' refused, path contains '..' component\n", |