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xhci: mem: Carefully calculate size for memory allocations

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Carefully calculate size for memory allocations, i.e. with help
of size_mul() macro from overflow.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20230317154715.535523-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2023-03-17 17:47:02 +02:00 committed by Greg Kroah-Hartman
parent 8be174835f
commit 347284984f
1 changed files with 5 additions and 4 deletions
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9
drivers/usb/host/xhci-mem.c
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@ -9,6 +9,7 @@
*/
#include <linux/usb.h>
#include <linux/overflow.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/dmapool.h>
@ -568,7 +569,7 @@ static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
gfp_t mem_flags)
{
struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
size_t size = size_mul(sizeof(struct xhci_stream_ctx), num_stream_ctxs);
if (size > MEDIUM_STREAM_ARRAY_SIZE)
return dma_alloc_coherent(dev, size,
@ -1660,7 +1661,7 @@ static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
goto fail_sp;
xhci->scratchpad->sp_array = dma_alloc_coherent(dev,
num_sp * sizeof(u64),
size_mul(sizeof(u64), num_sp),
&xhci->scratchpad->sp_dma, flags);
if (!xhci->scratchpad->sp_array)
goto fail_sp2;
@ -1799,7 +1800,7 @@ int xhci_alloc_erst(struct xhci_hcd *xhci,
struct xhci_segment *seg;
struct xhci_erst_entry *entry;
size = sizeof(struct xhci_erst_entry) * evt_ring->num_segs;
size = size_mul(sizeof(struct xhci_erst_entry), evt_ring->num_segs);
erst->entries = dma_alloc_coherent(xhci_to_hcd(xhci)->self.sysdev,
size, &erst->erst_dma_addr, flags);
if (!erst->entries)
@ -1830,7 +1831,7 @@ xhci_free_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
if (!ir)
return;
erst_size = sizeof(struct xhci_erst_entry) * (ir->erst.num_entries);
erst_size = sizeof(struct xhci_erst_entry) * ir->erst.num_entries;
if (ir->erst.entries)
dma_free_coherent(dev, erst_size,
ir->erst.entries,