1 files changed, 4 insertions, 1 deletions

diff --git a/ipc/msg.c b/ipc/msg.c
index 32e9bd837cde..e3e52ce01123 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -763,7 +763,10 @@ static inline int convert_mode(long *msgtyp, int msgflg)
         if (*msgtyp == 0)
                 return SEARCH_ANY;
         if (*msgtyp < 0) {
-                *msgtyp = -*msgtyp;
+                if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */
+                        *msgtyp = LONG_MAX;
+                else
+                        *msgtyp = -*msgtyp;
                 return SEARCH_LESSEQUAL;
         }
         if (msgflg & MSG_EXCEPT)