[dpdk-dev] [PATCH v2 1/2] mem: check if allocation size is too big
Anatoly Burakov
anatoly.burakov at intel.com
Mon Apr 30 13:21:42 CEST 2018
Mapping size is a 64-bit integer, but mmap() will accept size_t for
size mappings. A user could request a mapping with an alignment, which
would have overflown size_t, so check if (size + alignment) will
overflow size_t.
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
lib/librte_eal/common/eal_common_memory.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index 4c943b0..0ac7b33 100644
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -75,8 +75,13 @@ eal_get_virtual_area(void *requested_addr, size_t *size,
do {
map_sz = no_align ? *size : *size + page_sz;
+ if (map_sz > SIZE_MAX) {
+ RTE_LOG(ERR, EAL, "Map size too big\n");
+ rte_errno = E2BIG;
+ return NULL;
+ }
- mapped_addr = mmap(requested_addr, map_sz, PROT_READ,
+ mapped_addr = mmap(requested_addr, (size_t)map_sz, PROT_READ,
mmap_flags, -1, 0);
if (mapped_addr == MAP_FAILED && allow_shrink)
*size -= page_sz;
--
2.7.4
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