[edk2-devel] [edk2-libc Patch v2 1/1] edk2-libc/StdLib: Uninitialized global variable

[Jayaprakash, N]

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 at nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney at intel.com>
Co-authored-by: Kloper Dimitry <dimitry.kloper at intel.com>
Signed-off-by: Jayaprakash N <n.jayaprakash at intel.com>
---
 StdLib/BsdSocketLib/res_init.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/StdLib/BsdSocketLib/res_init.c b/StdLib/BsdSocketLib/res_init.c
index 613a76a..6421d9a 100644
--- a/StdLib/BsdSocketLib/res_init.c
+++ b/StdLib/BsdSocketLib/res_init.c
@@ -122,9 +122,10 @@ static u_int32_t net_mask __P((struct in_addr));
 
 struct __res_state _res
 # if defined(__BIND_RES_TEXT)
-    = { RES_TIMEOUT, }  /* Motorola, et al. */
-# endif
-    ;
+    = { RES_TIMEOUT, }; /* Motorola, et al. */
+#else
+    = {0};
+#endif
 
 
 /*
-- 
2.40.0.windows.1



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