- (djm) [openbsd-compat/sigact.c] Avoid NULL derefs in ancient sigaction

   replacement code; patch from ighighi AT gmail.com in bz#1240;
   ok dtucker

1 files changed, 39 insertions, 11 deletions

diff --git a/openbsd-compat/sigact.c b/openbsd-compat/sigact.c
index 8b8e4dd2c..d67845cf1 100644
--- a/openbsd-compat/sigact.c
+++ b/openbsd-compat/sigact.c
@@ -36,6 +36,7 @@
 /* OPENBSD ORIGINAL: lib/libcurses/base/sigaction.c */
 
 #include "includes.h"
+#include <errno.h>
 #include <signal.h>
 #include "sigact.h"
 
@@ -47,28 +48,39 @@
 int
 sigaction(int sig, struct sigaction *sigact, struct sigaction *osigact)
 {
-        return sigvec(sig, &(sigact->sv), &(osigact->sv));
+        return sigvec(sig, sigact ? &sigact->sv : NULL,
+            osigact ? &osigact->sv : NULL);
 }
 
 int
-sigemptyset (sigset_t * mask)
+sigemptyset (sigset_t *mask)
 {
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
         *mask = 0;
         return 0;
 }
 
 int
-sigprocmask (int mode, sigset_t * mask, sigset_t * omask)
+sigprocmask (int mode, sigset_t *mask, sigset_t *omask)
 {
         sigset_t current = sigsetmask(0);
 
-        if (omask) *omask = current;
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
 
-        if (mode==SIG_BLOCK)
+        if (omask)
+                *omask = current;
+
+        if (mode == SIG_BLOCK)
                 current |= *mask;
-        else if (mode==SIG_UNBLOCK)
+        else if (mode == SIG_UNBLOCK)
                 current &= ~*mask;
-        else if (mode==SIG_SETMASK)
+        else if (mode == SIG_SETMASK)
         current = *mask;
 
         sigsetmask(current);
@@ -76,28 +88,44 @@ sigprocmask (int mode, sigset_t * mask, sigset_t * omask)
 }
 
 int
-sigsuspend (sigset_t * mask)
+sigsuspend (sigset_t *mask)
 {
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
         return sigpause(*mask);
 }
 
 int
-sigdelset (sigset_t * mask, int sig)
+sigdelset (sigset_t *mask, int sig)
 {
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
         *mask &= ~sigmask(sig);
         return 0;
 }
 
 int
-sigaddset (sigset_t * mask, int sig)
+sigaddset (sigset_t *mask, int sig)
 {
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
         *mask |= sigmask(sig);
         return 0;
 }
 
 int
-sigismember (sigset_t * mask, int sig)
+sigismember (sigset_t *mask, int sig)
 {
+        if (!mask) {
+                errno = EINVAL;
+                return -1;
+        }
         return (*mask & sigmask(sig)) != 0;
 }