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authorGeert Uytterhoeven <geert@linux-m68k.org>2014-05-01 22:40:54 +0400
committerBrian Norris <computersforpeace@gmail.com>2014-05-21 03:35:29 +0400
commitf62cde49f9f02d6c205ab310b8fd4a29ddc49329 (patch)
tree0f0e1efecfba18539eb0490d21d48bb746ace83c /drivers/mtd
parentf306e8c3b667632952f1a4a74ffb910bbc06255f (diff)
downloadlinux-f62cde49f9f02d6c205ab310b8fd4a29ddc49329.tar.xz
mtd: Fix warning in access_ok() parameter passing
On m68k, where access_ok() doesn't cast the address parameter: drivers/mtd/mtdchar.c: In function 'mtdchar_write_ioctl': drivers/mtd/mtdchar.c:575:4: warning: passing argument 2 of 'access_ok' makes pointer from integer without a cast [enabled by default] arch/m68k/include/asm/uaccess_mm.h:17:90: note: expected 'const void *' but argument is of type '__u64' drivers/mtd/mtdchar.c:576:4: warning: passing argument 2 of 'access_ok' makes pointer from integer without a cast [enabled by default] arch/m68k/include/asm/uaccess_mm.h:17:90: note: expected 'const void *' but argument is of type '__u64' The address parameter of access_ok() is really a userspace pointer. On most architectures, access_ok() is a macro that casts the address parameter, hiding issues in its users. Move around and use the existing usr_data and usr_oob temporary variables to kill the warnings. Add a few "consts", and make more use of the temporaries while we're at it. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/mtdchar.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 7d4e7b9da3a1..a0f54e80670c 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -568,13 +568,18 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
{
struct mtd_write_req req;
struct mtd_oob_ops ops;
- void __user *usr_data, *usr_oob;
+ const void __user *usr_data, *usr_oob;
int ret;
- if (copy_from_user(&req, argp, sizeof(req)) ||
- !access_ok(VERIFY_READ, req.usr_data, req.len) ||
- !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
+ if (copy_from_user(&req, argp, sizeof(req)))
return -EFAULT;
+
+ usr_data = (const void __user *)(uintptr_t)req.usr_data;
+ usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
+ if (!access_ok(VERIFY_READ, usr_data, req.len) ||
+ !access_ok(VERIFY_READ, usr_oob, req.ooblen))
+ return -EFAULT;
+
if (!mtd->_write_oob)
return -EOPNOTSUPP;
@@ -583,10 +588,7 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
ops.ooblen = (size_t)req.ooblen;
ops.ooboffs = 0;
- usr_data = (void __user *)(uintptr_t)req.usr_data;
- usr_oob = (void __user *)(uintptr_t)req.usr_oob;
-
- if (req.usr_data) {
+ if (usr_data) {
ops.datbuf = memdup_user(usr_data, ops.len);
if (IS_ERR(ops.datbuf))
return PTR_ERR(ops.datbuf);
@@ -594,7 +596,7 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
ops.datbuf = NULL;
}
- if (req.usr_oob) {
+ if (usr_oob) {
ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
if (IS_ERR(ops.oobbuf)) {
kfree(ops.datbuf);