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-rw-r--r--src/udev/udev-builtin-usb_id.c34
1 files changed, 14 insertions, 20 deletions
diff --git a/src/udev/udev-builtin-usb_id.c b/src/udev/udev-builtin-usb_id.c
index dcb2468bf6..269aa4e1aa 100644
--- a/src/udev/udev-builtin-usb_id.c
+++ b/src/udev/udev-builtin-usb_id.c
@@ -151,11 +151,12 @@ static void set_scsi_type(char *to, const char *from, size_t len)
static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len)
{
- char *filename = NULL;
- int fd;
+ char _cleanup_free_ *filename = NULL;
+ int _cleanup_close_ fd = -1;
ssize_t size;
unsigned char buf[18 + 65535];
- unsigned int pos, strpos;
+ int pos = 0;
+ unsigned strpos = 0;
struct usb_interface_descriptor {
u_int8_t bLength;
u_int8_t bDescriptorType;
@@ -167,27 +168,20 @@ static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len
u_int8_t bInterfaceProtocol;
u_int8_t iInterface;
} __attribute__((packed));
- int err = 0;
- if (asprintf(&filename, "%s/descriptors", udev_device_get_syspath(dev)) < 0) {
- err = -1;
- goto out;
- }
+ if (asprintf(&filename, "%s/descriptors", udev_device_get_syspath(dev)) < 0)
+ return log_oom();
+
fd = open(filename, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
fprintf(stderr, "error opening USB device 'descriptors' file\n");
- err = -1;
- goto out;
+ return -errno;
}
+
size = read(fd, buf, sizeof(buf));
- close(fd);
- if (size < 18 || size == sizeof(buf)) {
- err = -1;
- goto out;
- }
+ if (size < 18 || size == sizeof(buf))
+ return -EIO;
- pos = 0;
- strpos = 0;
ifs_str[0] = '\0';
while (pos < size && strpos+7 < len-2) {
struct usb_interface_descriptor *desc;
@@ -213,13 +207,13 @@ static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len
memcpy(&ifs_str[strpos], if_str, 8),
strpos += 7;
}
+
if (strpos > 0) {
ifs_str[strpos++] = ':';
ifs_str[strpos++] = '\0';
}
-out:
- free(filename);
- return err;
+
+ return 0;
}
/*