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-rw-r--r--winsup/cygwin/syscalls.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index a936a21fd..54418c0a9 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -2175,7 +2175,8 @@ setegid32 (__gid32_t gid)
cygsid gsid;
HANDLE ptok;
- if (!(gsid.getfromgr (getgrgid32 (gid))))
+ struct __group32 * gr = getgrgid32 (gid);
+ if (!gr || gr->gr_gid != gid || !gsid.getfromgr (gr))
{
set_errno (EINVAL);
return -1;