Date: Sun, 15 Feb 2009 22:49:24 +0100 (CET) From: Stefan Richter Subject: ieee1394: raw1394: add sparse annotations to raw1394_compat_write Eliminate the following warnings in raw1394_compat_write()'s error return path, seen on x86-64 with CONFIG_COMPAT=y: drivers/ieee1394/raw1394.c:381:17: warning: incorrect type in return expression (different address spaces) drivers/ieee1394/raw1394.c:381:17: expected char const [noderef] * drivers/ieee1394/raw1394.c:381:17: got void * drivers/ieee1394/raw1394.c:2252:14: warning: incorrect type in argument 1 (different address spaces) drivers/ieee1394/raw1394.c:2252:14: expected void const *ptr drivers/ieee1394/raw1394.c:2252:14: got char const [noderef] *[assigned] buffer drivers/ieee1394/raw1394.c:2253:19: warning: incorrect type in argument 1 (different address spaces) drivers/ieee1394/raw1394.c:2253:19: expected void const *ptr drivers/ieee1394/raw1394.c:2253:19: got char const [noderef] *[assigned] buffer Signed-off-by: Stefan Richter --- drivers/ieee1394/raw1394.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) Index: linux/drivers/ieee1394/raw1394.c =================================================================== --- linux.orig/drivers/ieee1394/raw1394.c +++ linux/drivers/ieee1394/raw1394.c @@ -369,6 +369,7 @@ static const char __user *raw1394_compat { struct compat_raw1394_req __user *cr = (typeof(cr)) buf; struct raw1394_request __user *r; + r = compat_alloc_user_space(sizeof(struct raw1394_request)); #define C(x) __copy_in_user(&r->x, &cr->x, sizeof(r->x)) @@ -378,7 +379,8 @@ static const char __user *raw1394_compat C(tag) || C(sendb) || C(recvb)) - return ERR_PTR(-EFAULT); + return (__force const char __user *)ERR_PTR(-EFAULT); + return (const char __user *)r; } #undef C @@ -389,6 +391,7 @@ static int raw1394_compat_read(const char __user *buf, struct raw1394_request *r) { struct compat_raw1394_req __user *cr = (typeof(cr)) buf; + if (!access_ok(VERIFY_WRITE, cr, sizeof(struct compat_raw1394_req)) || P(type) || P(error) || @@ -400,6 +403,7 @@ raw1394_compat_read(const char __user *b P(sendb) || P(recvb)) return -EFAULT; + return sizeof(struct compat_raw1394_req); } #undef P @@ -2249,8 +2253,8 @@ static ssize_t raw1394_write(struct file sizeof(struct compat_raw1394_req) != sizeof(struct raw1394_request)) { buffer = raw1394_compat_write(buffer); - if (IS_ERR(buffer)) - return PTR_ERR(buffer); + if (IS_ERR((__force void *)buffer)) + return PTR_ERR((__force void *)buffer); } else #endif if (count != sizeof(struct raw1394_request)) {