[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/1 v2] xen: set error code on failures
On 05/12/16 09:23, Pan Bian wrote: > Variable rc is reset in the loop, and its value will be non-negative > during the second and after repeat of the loop. If it fails to allocate > memory then, it may return a non-negative integer, which indicates no > error. This patch fixes the bug, assigning "-ENOMEM" to rc when > kzalloc() or alloc_page() returns NULL, and removing the initialization > of rc outside of the loop. > > v1 is reviewed by: Juergen Gross <jgross@xxxxxxxx> Not being a real problem in this case I prefer spelling out explicit "Acked-by:" or "Reviewed-by:" tags myself. So for this version you can have: Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Juergen > > Signed-off-by: Pan Bian <bianpan2016@xxxxxxx> > --- > drivers/xen/gntalloc.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c > index 7a47c4c..1bf55a3 100644 > --- a/drivers/xen/gntalloc.c > +++ b/drivers/xen/gntalloc.c > @@ -127,18 +127,21 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref > *op, > struct gntalloc_gref *gref, *next; > > readonly = !(op->flags & GNTALLOC_FLAG_WRITABLE); > - rc = -ENOMEM; > for (i = 0; i < op->count; i++) { > gref = kzalloc(sizeof(*gref), GFP_KERNEL); > - if (!gref) > + if (!gref) { > + rc = -ENOMEM; > goto undo; > + } > list_add_tail(&gref->next_gref, &queue_gref); > list_add_tail(&gref->next_file, &queue_file); > gref->users = 1; > gref->file_index = op->index + i * PAGE_SIZE; > gref->page = alloc_page(GFP_KERNEL|__GFP_ZERO); > - if (!gref->page) > + if (!gref->page) { > + rc = -ENOMEM; > goto undo; > + } > > /* Grant foreign access to the page. */ > rc = gnttab_grant_foreign_access(op->domid, > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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