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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@frequentis.com>
This commit is contained in:
Horst Kronstorfer 2012-02-07 10:02:53 +01:00 committed by Jon Loeliger
parent e280442e08
commit a6e6c60e3a
1 changed files with 2 additions and 0 deletions
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2
treesource.c
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@ -23,6 +23,7 @@
extern FILE *yyin; extern FILE *yyin;
extern int yyparse(void); extern int yyparse(void);
extern YYLTYPE yylloc;
struct boot_info *the_boot_info; struct boot_info *the_boot_info;
int treesource_error; int treesource_error;
@ -34,6 +35,7 @@ struct boot_info *dt_from_source(const char *fname)
srcfile_push(fname); srcfile_push(fname);
yyin = current_srcfile->f; yyin = current_srcfile->f;
yylloc.file = current_srcfile;
if (yyparse() != 0) if (yyparse() != 0)
die("Unable to parse input tree\n"); die("Unable to parse input tree\n");