On Wed, 2021-01-06 at 14:36 +0800, YANG LI wrote: > The snprintf() function returns the number of characters which would > have been printed if there were enough space, but the scnprintf() > returns the number of characters which were actually printed. If the > buffer is not large enough, then using snprintf() would result in a > read overflow and an information leak. This error was found with the > help of coccicheck. In all cases, the buffer _is_ large enough. tmpi is length 5 and ok. include/sound/core.h: char shortname[32]; /* short name of this soundcard */ include/sound/core.h: char longname[80]; /* name of this soundcard */ include/sound/core.h: char mixername[80]; /* mixer name */ _show function lengths are OK for all the uses with PAGE_SIZE. And it's probably better to use sysfs_emit for all the _show functions
