SOLARIS: fix for AFS_PAG_ONEGROUP_ENV for Solaris 11

Fix a bug introduced in commit aab1e71628e6a4ce68c5e59e2f815867438280d1
in which a pointer was incorrectly checked for a NULL value.

Fixes a crash when a PAG is set on Solaris.

    # mdb unix.1 vmcore.1
    > ::status
    ...
    panic message:
    BAD TRAP: type=e (#pf Page fault) rp=fffffffc802ba8f0 addr=0 occurred in
      module "afs" due to a NULL pointer dereference
    > ::stack
    pag_to_gidset+0x145()
    setpag+0xcc()
    AddPag+0x3a()
    afs_setpag+0x58()
    Afs_syscall+0x115()

The crash occurs since gidslot is NULL during the assignment:

    *gidslot = pagvalue;

Change-Id: Ic4d50c6b046d10faa49cd4363692e0302707583d
Reviewed-on: https://gerrit.openafs.org/12508
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>

diff --git a/src/afs/SOLARIS/osi_groups.c b/src/afs/SOLARIS/osi_groups.c
index 6358821..4cbb62f 100644 (file)
--- a/src/afs/SOLARIS/osi_groups.c
+++ b/src/afs/SOLARIS/osi_groups.c
@@ -96,7 +96,7 @@ pag_to_gidset(afs_uint32 pagvalue, gid_t *gidset, int *a_ngroups,
         }
     }
 
-    if (gidslot != NULL) {
+    if (gidslot == NULL) {
         /* If we don't already have a PAG, grow the groups list by one, and put
          * our PAG in the new empty slot. */
         if ((sizeof(gidset[0])) * (ngroups + 1) > gidset_sz) {