On Fri, Jan 17, 2014 at 5:46 PM, David Laight <david.lai...@aculab.com> wrote: > From: Chen-Yu Tsai >> snprintf should be passed the complete size of the buffer, including >> the space for '\0'. The previous code resulted in the *_reset and >> *_shutdown strings being truncated. > ... >> diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c > ... >> - snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name); >> - snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name); >> + snprintf(rfkill->reset_name, len + 7 , "%s_reset", rfkill->name); >> + snprintf(rfkill->shutdown_name, len + 10, "%s_shutdown", rfkill->name); > > I can't find the context for the above, but they look very dubious. > I'd expect: snprintf(foo, sizeof foo, ...). > If you are trying to truncate rfkill->name you need to use %.*s.
The driver allocates these buffers on the fly, a few lines above: len = strlen(rfkill->name); rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL); rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL); I am not trying to truncate rfkill->name. Rather, the buffer length passed to snprintf was wrong, so the resulting name was truncated by one character. Thanks, ChenYu -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.