[binutils-gdb] [ARM] Fix NULL dereference of march_ext_opt

[Thomas Preud'homme]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e7da50fa4b4f770240feda51ba60f6255073e54f

commit e7da50fa4b4f770240feda51ba60f6255073e54f
Author: Thomas Preud'homme <thomas.preudhomme@arm.com>
Date:   Fri Mar 2 10:46:32 2018 +0000

    [ARM] Fix NULL dereference of march_ext_opt
    
    Commit 4d354d8b8932d450c77fd52f3501662827523014 introduced a NULL
    pointer dereference by replacing a pointer assignment by a pointer
    dereference assignment without adding a NULL pointer check. This patch
    fixes it.
    
    2018-03-02  Thomas Preud'homme  <thomas.preudhomme@arm.com>
    
    gas/
    	* config/tc-arm.c (md_begin): Add NULL pointer check before
    	dereferencing march_ext_opt.

Diff:
---
 gas/ChangeLog       | 5 +++++
 gas/config/tc-arm.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 46711fd..d8f5892 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-02  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* config/tc-arm.c (md_begin): Add NULL pointer check before
+	dereferencing march_ext_opt.
+
 2018-03-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* config/tc-arm.c (cpu_variant, arm_arch_used, thumb_arch_used,
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index ac403cc..eda9890 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -25407,7 +25407,7 @@ md_begin (void)
 	 from the processor.  */
       if (mcpu_fpu_opt)
 	selected_fpu = *mcpu_fpu_opt;
-      else
+      else if (march_fpu_opt)
 	selected_fpu = *march_fpu_opt;
 #else
       selected_fpu = fpu_default;