Fix hash lowercase conversion for malformed string.

git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@177 36d66b0a-2a48-0410-832c-cd162a569da5

diff --git a/luks/keymanage.c b/luks/keymanage.c
index 1e2e8ae..14d276b 100644 (file)
--- a/luks/keymanage.c
+++ b/luks/keymanage.c
@@ -278,9 +278,9 @@ static int _check_and_convert_hdr(const char *device,
        return r;
 }
 
-static void _to_lower(char *str)
+static void _to_lower(char *str, unsigned max_len)
 {
-       for(; *str; str++)
+       for(; *str && max_len; str++, max_len--)
                if (isupper(*str))
                        *str = tolower(*str);
 }
@@ -289,7 +289,7 @@ static void LUKS_fix_header_compatible(struct luks_phdr *header)
 {
        /* Old cryptsetup expects "sha1", gcrypt allows case insensistive names,
         * so always convert hash to lower case in header */
-       _to_lower(header->hashSpec);
+       _to_lower(header->hashSpec, LUKS_HASHSPEC_L);
 }
 
 int LUKS_read_phdr_backup(const char *backup_file,