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[script] Avoid trying to read final character of a zero-length string

Detected using Valgrind.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 11 lat temu
rodzic
commit
e52c24492a
1 zmienionych plików z 2 dodań i 2 usunięć
  1. 2
    2
      src/image/script.c

+ 2
- 2
src/image/script.c Wyświetl plik

@@ -92,11 +92,11 @@ static int process_script ( struct image *image,
92 92
 		script_offset += ( frag_len + 1 );
93 93
 
94 94
 		/* Strip trailing CR, if present */
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-		if ( line[ len - 1 ] == '\r' )
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+		if ( len && ( line[ len - 1 ] == '\r' ) )
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 			len--;
97 97
 
98 98
 		/* Handle backslash continuations */
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-		if ( line[ len - 1 ] == '\\' ) {
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+		if ( len && ( line[ len - 1 ] == '\\' ) ) {
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 			len--;
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 			rc = -EINVAL;
102 102
 			continue;

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