net/bnxt/tf_core: check backing store allocation

A backing store table allocation failed due to lack of memory and
resulted in a crash because the result of the allocation was not
checked for validity.

Signed-off-by: Peter Spreadborough <[email protected]>
Reviewed-by: Manish Kurup <[email protected]>
Acked-by: Ajit Khaparde <[email protected]>

Author: Peter Spreadborough

drivers/net/bnxt/tf_core/v3/tfc_tbl_scope.c

@@ -505,6 +505,8 @@ static int alloc_link_pbl(struct tfc_ts_mem_cfg *mem_cfg, uint32_t page_size,
 								RTE_MEMZONE_SIZE_HINT_ONLY |
 								RTE_MEMZONE_IOVA_CONTIG,
 								page_size);
+		if (!mem_cfg->ts_mz.mz)
+			return -ENOMEM;
 	}
 	memset(mem_cfg->ts_mz.mz->addr, 0, mem_cfg->ts_mz.mz->len);
 	mem_cfg->ts_mz.page_count = total_pages;