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dirhash.c (ext2fs_dirhash): Fix bug which caused MD4 

calculations for names > 32 characters to be completely
	bogus.  Changed MD4 calculation to match what is currently
	being used in the CVS gkernel tree.
bitmap-optimize
Theodore Ts'o 2002-07-23 13:11:53 -04:00
parent 3214a453db
commit cc90bdfd08
2 changed files with 12 additions and 4 deletions
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7
lib/ext2fs/ChangeLog
View File

@ -1,3 +1,10 @@
2002-07-23 Theodore Ts'o <tytso@mit.edu>
* dirhash.c (ext2fs_dirhash): Fix bug which caused MD4
calculations for names > 32 characters to be completely
bogus. Changed MD4 calculation to match what is currently
being used in the CVS gkernel tree.
2002-07-19 Theodore Ts'o <tytso@mit.edu>
* ext2_fs.h: Add s_hash_seed and s_def_hash_version to the

9
lib/ext2fs/dirhash.c
View File

@ -75,7 +75,7 @@ static __u32 halfMD4Transform (__u32 buf[4], __u32 const in[])
buf[2] += c;
buf[3] += d;
return (buf[1] << 1); /* "most hashed" word */
return ((buf[1] + b) & ~1); /* "most hashed" word */
/* Alternative: return sum of all words? */
}
@ -121,7 +121,7 @@ errcode_t ext2fs_dirhash(int version, const char *name, int len,
{
__u32 hash;
__u32 minor_hash = 0;
char *p;
const char *p;
int i;
/* Check to see if the seed is all zero's */
@ -144,10 +144,11 @@ errcode_t ext2fs_dirhash(int version, const char *name, int len,
buf[2] = 0x98badcfe;
buf[3] = 0x10325476;
} else
memcpy(buf, in, sizeof(buf));
memcpy(buf, seed, sizeof(buf));
p = name;
while (len) {
if (len < 32) {
memcpy(in, name, len);
memcpy(in, p, len);
memset(in+len, 0, 32-len);
hash = halfMD4Transform(buf, (__u32 *) in);
break;