From d0969d1949cc67a0f100f30ad69ec7ec1eca70d2 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Sun, 8 May 2011 20:44:32 +0200 Subject: HPFS: Fix some unaligned accesses Fix some unaligned accesses Signed-off-by: Mikulas Patocka Signed-off-by: Linus Torvalds --- fs/hpfs/ea.c | 41 +++++++++++++++++++++-------------------- fs/hpfs/hpfs.h | 3 ++- fs/hpfs/hpfs_fn.h | 12 +++++++++--- 3 files changed, 32 insertions(+), 24 deletions(-) diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c index 1bbc37ddff4..7f1d90ca5ee 100644 --- a/fs/hpfs/ea.c +++ b/fs/hpfs/ea.c @@ -24,7 +24,7 @@ void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) } if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; if (ea->indirect) { - if (le16_to_cpu(ea->valuelen) != 8) { + if (ea_valuelen(ea) != 8) { hpfs_error(s, "ea->indirect set while ea->valuelen!=8, %s %08x, pos %08x", ano ? "anode" : "sectors", a, pos); return; @@ -33,7 +33,7 @@ void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) return; hpfs_ea_remove(s, ea_sec(ea), ea->anode, ea_len(ea)); } - pos += ea->namelen + le16_to_cpu(ea->valuelen) + 5; + pos += ea->namelen + ea_valuelen(ea) + 5; } if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9); else { @@ -82,10 +82,10 @@ int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, if (!strcmp(ea->name, key)) { if (ea->indirect) goto indirect; - if (le16_to_cpu(ea->valuelen) >= size) + if (ea_valuelen(ea) >= size) return -EINVAL; - memcpy(buf, ea_data(ea), le16_to_cpu(ea->valuelen)); - buf[le16_to_cpu(ea->valuelen)] = 0; + memcpy(buf, ea_data(ea), ea_valuelen(ea)); + buf[ea_valuelen(ea)] = 0; return 0; } a = le32_to_cpu(fnode->ea_secno); @@ -106,14 +106,14 @@ int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, if (!strcmp(ea->name, key)) { if (ea->indirect) goto indirect; - if (le16_to_cpu(ea->valuelen) >= size) + if (ea_valuelen(ea) >= size) return -EINVAL; - if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, le16_to_cpu(ea->valuelen), buf)) + if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf)) return -EIO; - buf[le16_to_cpu(ea->valuelen)] = 0; + buf[ea_valuelen(ea)] = 0; return 0; } - pos += ea->namelen + le16_to_cpu(ea->valuelen) + 5; + pos += ea->namelen + ea_valuelen(ea) + 5; } return -ENOENT; indirect: @@ -138,12 +138,12 @@ char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *si if (!strcmp(ea->name, key)) { if (ea->indirect) return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea)); - if (!(ret = kmalloc((*size = le16_to_cpu(ea->valuelen)) + 1, GFP_NOFS))) { + if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { printk("HPFS: out of memory for EA\n"); return NULL; } - memcpy(ret, ea_data(ea), le16_to_cpu(ea->valuelen)); - ret[le16_to_cpu(ea->valuelen)] = 0; + memcpy(ret, ea_data(ea), ea_valuelen(ea)); + ret[ea_valuelen(ea)] = 0; return ret; } a = le32_to_cpu(fnode->ea_secno); @@ -164,18 +164,18 @@ char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *si if (!strcmp(ea->name, key)) { if (ea->indirect) return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea)); - if (!(ret = kmalloc((*size = le16_to_cpu(ea->valuelen)) + 1, GFP_NOFS))) { + if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { printk("HPFS: out of memory for EA\n"); return NULL; } - if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, le16_to_cpu(ea->valuelen), ret)) { + if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) { kfree(ret); return NULL; } - ret[le16_to_cpu(ea->valuelen)] = 0; + ret[ea_valuelen(ea)] = 0; return ret; } - pos += ea->namelen + le16_to_cpu(ea->valuelen) + 5; + pos += ea->namelen + ea_valuelen(ea) + 5; } return NULL; } @@ -202,7 +202,7 @@ void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, if (ea->indirect) { if (ea_len(ea) == size) set_indirect_ea(s, ea->anode, ea_sec(ea), data, size); - } else if (le16_to_cpu(ea->valuelen) == size) { + } else if (ea_valuelen(ea) == size) { memcpy(ea_data(ea), data, size); } return; @@ -228,12 +228,12 @@ void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, set_indirect_ea(s, ea->anode, ea_sec(ea), data, size); } else { - if (le16_to_cpu(ea->valuelen) == size) + if (ea_valuelen(ea) == size) hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); } return; } - pos += ea->namelen + le16_to_cpu(ea->valuelen) + 5; + pos += ea->namelen + ea_valuelen(ea) + 5; } if (!le16_to_cpu(fnode->ea_offs)) { /*if (le16_to_cpu(fnode->ea_size_s)) { @@ -254,7 +254,8 @@ void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, ea = fnode_end_ea(fnode); *(char *)ea = 0; ea->namelen = strlen(key); - ea->valuelen = cpu_to_le16(size); + ea->valuelen_lo = size; + ea->valuelen_hi = size >> 8; strcpy(ea->name, key); memcpy(ea_data(ea), data, size); fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5); diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h index 91a6223893f..8b0650aae32 100644 --- a/fs/hpfs/hpfs.h +++ b/fs/hpfs/hpfs.h @@ -546,7 +546,8 @@ struct extended_attribute where real value starts */ #endif u8 namelen; /* length of name, bytes */ - u16 valuelen; /* length of value, bytes */ + u8 valuelen_lo; /* length of value, bytes */ + u8 valuelen_hi; /* length of value, bytes */ u8 name[0]; /* u8 name[namelen]; ascii attrib name diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h index f99377306b1..dd552f862c8 100644 --- a/fs/hpfs/hpfs_fn.h +++ b/fs/hpfs/hpfs_fn.h @@ -13,6 +13,7 @@ #include #include #include +#include #include "hpfs.h" @@ -135,19 +136,24 @@ static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); } +static unsigned ea_valuelen(struct extended_attribute *ea) +{ + return ea->valuelen_lo + 256 * ea->valuelen_hi; +} + static inline struct extended_attribute *next_ea(struct extended_attribute *ea) { - return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + le16_to_cpu(ea->valuelen)); + return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); } static inline secno ea_sec(struct extended_attribute *ea) { - return le32_to_cpu(*((secno *)((char *)ea + 9 + ea->namelen))); + return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen))); } static inline secno ea_len(struct extended_attribute *ea) { - return le32_to_cpu(*((secno *)((char *)ea + 5 + ea->namelen))); + return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen))); } static inline char *ea_data(struct extended_attribute *ea) -- cgit v1.2.3