From aac870a8770281c6ad619b538df77840b9513a0b Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 4 Jun 2010 07:34:40 -0300 Subject: [PATCH] V4L/DVB: media/radio: fix copy_to_user to user handling copy_to/from_user() returns the number of bytes remaining to be copied but the code here was testing for negative returns. I modified it to return -EFAULT. These functions are called from si4713_s_ext_ctrls() and that only tests for negative error codes. Signed-off-by: Dan Carpenter Signed-off-by: Mauro Carvalho Chehab --- drivers/media/radio/si4713-i2c.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/media/radio/si4713-i2c.c b/drivers/media/radio/si4713-i2c.c index ab63dd5b25c..fc7f4b79464 100644 --- a/drivers/media/radio/si4713-i2c.c +++ b/drivers/media/radio/si4713-i2c.c @@ -1009,8 +1009,10 @@ static int si4713_write_econtrol_string(struct si4713_device *sdev, goto exit; } rval = copy_from_user(ps_name, control->string, len); - if (rval < 0) + if (rval) { + rval = -EFAULT; goto exit; + } ps_name[len] = '\0'; if (strlen(ps_name) % vqc.step) { @@ -1031,8 +1033,10 @@ static int si4713_write_econtrol_string(struct si4713_device *sdev, goto exit; } rval = copy_from_user(radio_text, control->string, len); - if (rval < 0) + if (rval) { + rval = -EFAULT; goto exit; + } radio_text[len] = '\0'; if (strlen(radio_text) % vqc.step) { @@ -1367,6 +1371,8 @@ static int si4713_read_econtrol_string(struct si4713_device *sdev, } rval = copy_to_user(control->string, sdev->rds_info.ps_name, strlen(sdev->rds_info.ps_name) + 1); + if (rval) + rval = -EFAULT; break; case V4L2_CID_RDS_TX_RADIO_TEXT: @@ -1377,6 +1383,8 @@ static int si4713_read_econtrol_string(struct si4713_device *sdev, } rval = copy_to_user(control->string, sdev->rds_info.radio_text, strlen(sdev->rds_info.radio_text) + 1); + if (rval) + rval = -EFAULT; break; default: -- 2.39.3