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misc: genwqe: should return proper error value.

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The function should return -EFAULT when copy_from_user fails. Even
though the caller does not distinguish them. but we should keep backward
compatibility.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
zhong jiang 2018-09-20 10:29:13 +08:00 committed by Greg Kroah-Hartman
parent 6dbfdc1a4e
commit 02241995b0
1 changed files with 7 additions and 6 deletions
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13
drivers/misc/genwqe/card_utils.c
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@ -298,7 +298,7 @@ static int genwqe_sgl_size(int num_pages)
int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
void __user *user_addr, size_t user_size, int write)
{
int rc;
int ret = -ENOMEM;
struct pci_dev *pci_dev = cd->pci_dev;
sgl->fpage_offs = offset_in_page((unsigned long)user_addr);
@ -318,7 +318,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
if (get_order(sgl->sgl_size) > MAX_ORDER) {
dev_err(&pci_dev->dev,
"[%s] err: too much memory requested!\n", __func__);
return -ENOMEM;
return ret;
}
sgl->sgl = __genwqe_alloc_consistent(cd, sgl->sgl_size,
@ -326,7 +326,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
if (sgl->sgl == NULL) {
dev_err(&pci_dev->dev,
"[%s] err: no memory available!\n", __func__);
return -ENOMEM;
return ret;
}
/* Only use buffering on incomplete pages */
@ -339,7 +339,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
/* Sync with user memory */
if (copy_from_user(sgl->fpage + sgl->fpage_offs,
user_addr, sgl->fpage_size)) {
rc = -EFAULT;
ret = -EFAULT;
goto err_out;
}
}
@ -352,7 +352,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
/* Sync with user memory */
if (copy_from_user(sgl->lpage, user_addr + user_size -
sgl->lpage_size, sgl->lpage_size)) {
rc = -EFAULT;
ret = -EFAULT;
goto err_out2;
}
}
@ -374,7 +374,8 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
sgl->sgl = NULL;
sgl->sgl_dma_addr = 0;
sgl->sgl_size = 0;
return -ENOMEM;
return ret;
}
int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,