kernel/dma/swiotlb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 8ca7d505d61c..f63d15e94d35 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -342,6 +342,7 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
 {
 	struct io_tlb_mem *mem = io_tlb_default_mem;
 	int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
+	unsigned long offset = (tlb_addr - mem->start) & (IO_TLB_SIZE - 1);
 	phys_addr_t orig_addr = mem->slots[index].orig_addr;
 	size_t alloc_size = mem->slots[index].alloc_size;
 	unsigned long pfn = PFN_DOWN(orig_addr);
@@ -350,6 +351,14 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
 	if (orig_addr == INVALID_PHYS_ADDR)
 		return;
 
+	if (offset > alloc_size) {
+		dev_WARN_ONCE(dev, 1,
+			"Buffer overflow detected. Offset: %lu. Mapping size: %zu.\n",
+			offset, size);
+		return;
+	}
+	alloc_size -= offset;
+	orig_addr += offset;
 	if (size > alloc_size) {
 		dev_WARN_ONCE(dev, 1,
 			"Buffer overflow detected. Allocation size: %zu. Mapping size: %zu.\n",