[Crosstoolchain-logs] [device-tree-compiler] 33/198: dtc: Fix zero-length input segfault

[Hector Oron]

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zumbi pushed a commit to branch upstream/1.4.x
in repository device-tree-compiler.

commit a6e6c60e3a97a6b3a033cd052bb3740fd53cbf4c
Author: Horst Kronstorfer <hkronsto at frequentis.com>
Date:   Tue Feb 7 10:02:53 2012 +0100

    dtc: Fix zero-length input segfault
    
    This patch fixes a segmentation fault caused by dereferencing a NULL
    pointer (pos->file aka yylloc.file) in srcpos_string when the input
    length is 0 (fe 'dtc </dev/null'.) Reason: yylloc.file is initialized
    with 0 and the tokenizer, which updates yylloc.file via srcpos_update
    doesn't get a chance to run on zero-length input.
    
    Signed-off-by: Horst Kronstorfer <hkronsto at frequentis.com>
---
 treesource.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/treesource.c b/treesource.c
index c09aafa..33eeba5 100644
--- a/treesource.c
+++ b/treesource.c
@@ -23,6 +23,7 @@
 
 extern FILE *yyin;
 extern int yyparse(void);
+extern YYLTYPE yylloc;
 
 struct boot_info *the_boot_info;
 int treesource_error;
@@ -34,6 +35,7 @@ struct boot_info *dt_from_source(const char *fname)
 
 	srcfile_push(fname);
 	yyin = current_srcfile->f;
+	yylloc.file = current_srcfile;
 
 	if (yyparse() != 0)
 		die("Unable to parse input tree\n");

-- 
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