put_entry() is used during writing binary policies. Avoid short writes
due to an overflow.
Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
---
libsepol/src/services.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libsepol/src/services.c b/libsepol/src/services.c
index 062510ab..07ae051b 100644
--- a/libsepol/src/services.c
+++ b/libsepol/src/services.c
@@ -1708,7 +1708,10 @@ int next_entry(void *buf, struct policy_file *fp, size_t bytes)
size_t put_entry(const void *ptr, size_t size, size_t n,
struct policy_file *fp)
{
- size_t bytes = size * n;
+ size_t bytes;
+
+ if (__builtin_mul_overflow(size, n, &bytes))
+ return 0;
switch (fp->type) {
case PF_USE_STDIO:
--
2.40.1
