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-rw-r--r--erts/emulator/drivers/common/inet_drv.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 47eb5df7dd..b44464d6da 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -634,9 +634,13 @@ static size_t my_strnlen(const char *s, size_t maxlen)
* header length. To get the header length we use
* the pointer difference from the cmsg start pointer
* to the CMSG_DATA(cmsg) pointer.
+ *
+ * Some platforms (seen on ppc Linux 2.6.29-3.ydl61.3)
+ * may return 0 as the cmsg_len if the cmsg is to be ignored.
*/
#define LEN_CMSG_DATA(cmsg) \
- ((cmsg)->cmsg_len - ((char*)CMSG_DATA(cmsg) - (char*)(cmsg)))
+ ((cmsg)->cmsg_len < sizeof (struct cmsghdr) ? 0 : \
+ (cmsg)->cmsg_len - ((char*)CMSG_DATA(cmsg) - (char*)(cmsg)))
#define NXT_CMSG_HDR(cmsg) \
((struct cmsghdr*)(((char*)(cmsg)) + CMSG_SPACE(LEN_CMSG_DATA(cmsg))))
#endif