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authorJulia Lawall <julia@diku.dk>2010-05-22 10:22:49 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-05-22 11:49:37 +0100
commitdf1f1d1cb43b4ffdef5ba5f0623e2f73e94ce030 (patch)
treefdef68b0b5230b9f49f7b26eee33aee4e4f042e3 /drivers/mtd/mtdchar.c
parent39c5837d7968ffd68e1d3c79efba1631b7f513d9 (diff)
drivers/mtd: Use memdup_user
Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/mtdchar.c')
-rw-r--r--drivers/mtd/mtdchar.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 8bb5e4a66328..8b223c0343ee 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -404,14 +404,9 @@ static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
return -EINVAL;
- ops.oobbuf = kmalloc(length, GFP_KERNEL);
- if (!ops.oobbuf)
- return -ENOMEM;
-
- if (copy_from_user(ops.oobbuf, ptr, length)) {
- kfree(ops.oobbuf);
- return -EFAULT;
- }
+ ops.oobbuf = memdup_user(ptr, length);
+ if (IS_ERR(ops.oobbuf))
+ return PTR_ERR(ops.oobbuf);
start &= ~((uint64_t)mtd->oobsize - 1);
ret = mtd->write_oob(mtd, start, &ops);