[edk2-devel] [edk2-libc Patch 1/1] edk2-libc/StdLib: Fix uninitialized global variable

["Jayaprakash, N" <n.jayaprakash@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4506

res_init() is called from different places in sockets library. It depends
on global _res variable containing a state.

The problem is that if __BIND_RES_TEXT macro is not defined, _res is not
initialized. Depending on compiler and build optimization this can fill the
variable with garbage that is later used by res_init().

Fix is trivial - explicitly initialize _res.

Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jayaprakash N <n.jayaprakash@intel.com>
Signed-off-by: Kloper Dimitry <dimitry.kloper@intel.com>
---
 StdLib/BsdSocketLib/res_init.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/StdLib/BsdSocketLib/res_init.c b/StdLib/BsdSocketLib/res_init.c
index 613a76a..faf2b5e 100644
--- a/StdLib/BsdSocketLib/res_init.c
+++ b/StdLib/BsdSocketLib/res_init.c
@@ -121,9 +121,11 @@ static u_int32_t net_mask __P((struct in_addr));
  */
 
 struct __res_state _res
-# if defined(__BIND_RES_TEXT)
+#if defined(__BIND_RES_TEXT)
     = { RES_TIMEOUT, }  /* Motorola, et al. */
-# endif
+#endif
+    = {0}
+#endif
     ;
 
 
-- 
2.40.0.windows.1



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