From 624f0c186978f9cb0ce6582f445922eaaa4a7f4a Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 10 Jan 2012 19:08:53 -0200 Subject: [PATCH] [media] dvb_ca_en50221: fix compilation breakage As reported by Toralf: the build failed with : CC [M] drivers/media/dvb/dvb-core/dvb_ca_en50221.o In file included from arch/x86/include/asm/uaccess.h:573:0, from include/linux/poll.h:14, from drivers/media/dvb/dvb-core/dvbdev.h:27, from drivers/media/dvb/dvb-core/dvb_ca_en50221.h:27, from drivers/media/dvb/dvb-core/dvb_ca_en50221.c:41: In function "copy_from_user", inlined from "dvb_ca_en50221_io_write" at drivers/media/dvb/dvb-core/dvb_ca_en50221.c:1314:26: arch/x86/include/asm/uaccess_32.h:211:26: error: call to "copy_from_user_overflow" declared with attribute error: copy_from_user() buffer size is not provably correct Reported-by: Toralf Foerster Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/dvb-core/dvb_ca_en50221.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c index 7ea517b7e186..9be65a3b931f 100644 --- a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c +++ b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c @@ -1306,6 +1306,10 @@ static ssize_t dvb_ca_en50221_io_write(struct file *file, /* fragment the packets & store in the buffer */ while (fragpos < count) { fraglen = ca->slot_info[slot].link_buf_size - 2; + if (fraglen < 0) + break; + if (fraglen > HOST_LINK_BUF_SIZE - 2) + fraglen = HOST_LINK_BUF_SIZE - 2; if ((count - fragpos) < fraglen) fraglen = count - fragpos; -- 2.39.5