5.4-stable review patch. If anyone has any objections, please let me know.
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From: Oliver Neukum oneukum@suse.com
commit 71c717cd8a2e180126932cc6851ff21c1d04d69a upstream.
This reverts commit 86b20af11e84c26ae3fde4dcc4f490948e3f8035.
This patch leads to passing 0 to simple_read_from_buffer() as a fifth argument, turning the read method into a nop. The change is fundamentally flawed, as it breaks the driver.
Signed-off-by: Oliver Neukum oneukum@suse.com Cc: stable stable@kernel.org Link: https://lore.kernel.org/r/20241007094004.242122-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/misc/yurex.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-)
--- a/drivers/usb/misc/yurex.c +++ b/drivers/usb/misc/yurex.c @@ -34,8 +34,6 @@ #define YUREX_BUF_SIZE 8 #define YUREX_WRITE_TIMEOUT (HZ*2)
-#define MAX_S64_STRLEN 20 /* {-}922337203685477580{7,8} */ - /* table of devices that work with this driver */ static struct usb_device_id yurex_table[] = { { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) }, @@ -404,7 +402,8 @@ static ssize_t yurex_read(struct file *f { struct usb_yurex *dev; int len = 0; - char in_buffer[MAX_S64_STRLEN]; + char in_buffer[20]; + unsigned long flags;
dev = file->private_data;
@@ -414,16 +413,14 @@ static ssize_t yurex_read(struct file *f return -ENODEV; }
- if (WARN_ON_ONCE(dev->bbu > S64_MAX || dev->bbu < S64_MIN)) { - mutex_unlock(&dev->io_mutex); - return -EIO; - } - - spin_lock_irq(&dev->lock); - scnprintf(in_buffer, MAX_S64_STRLEN, "%lld\n", dev->bbu); - spin_unlock_irq(&dev->lock); + spin_lock_irqsave(&dev->lock, flags); + len = snprintf(in_buffer, 20, "%lld\n", dev->bbu); + spin_unlock_irqrestore(&dev->lock, flags); mutex_unlock(&dev->io_mutex);
+ if (WARN_ON_ONCE(len >= sizeof(in_buffer))) + return -EIO; + return simple_read_from_buffer(buffer, count, ppos, in_buffer, len); }