fs/orangefs: use snprintf() instead of sprintf()

sprintf() is discouraged for use with bounded destination buffers
as it does not prevent buffer overflows when the formatted output
exceeds the destination buffer size. snprintf() is a safer
alternative as it limits the number of bytes written and ensures
NUL-termination.

Replace sprintf() with snprintf() for copying the debug string
into a temporary buffer, using ORANGEFS_MAX_DEBUG_STRING_LEN as
the maximum size to ensure safe formatting and prevent memory
corruption in edge cases.

EDIT: After this patch sat on linux-next for a few days, Dan
Carpenter saw it and suggested that I use scnprintf instead of
snprintf. I made the change and retested.

Signed-off-by: Amir Mohammad Jahangirzad <[e-mail]>
Signed-off-by: Mike Marshall <[e-mail]>

fs/orangefs/orangefs-debugfs.c

···
 		goto out;
 
 	mutex_lock(&orangefs_debug_lock);
-	sprintf_ret = sprintf(buf, "%s", (char *)file->private_data);
+	sprintf_ret = scnprintf(buf, ORANGEFS_MAX_DEBUG_STRING_LEN, "%s", (char *)file->private_data);
 	mutex_unlock(&orangefs_debug_lock);
 
 	read_ret = simple_read_from_buffer(ubuf, count, ppos, buf, sprintf_ret);