From 9fba70569d9c3c253dba10ebbe3359f2157e504c Mon Sep 17 00:00:00 2001 From: Andrew Gabbasov Date: Fri, 15 Jan 2016 02:44:21 -0600 Subject: [PATCH] udf: Adjust UDF_NAME_LEN to better reflect actual restrictions Actual name length restriction is 254 bytes, this is used in 'ustr' structure, and this is what fits into UDF File Ident structures. And in most cases the constant is used as UDF_NAME_LEN-2. So, it's better to just modify the constant to make it closer to reality. Also, in some cases it's useful to have a separate constant for the maximum length of file name field in CS0 encoding in UDF File Ident structures. Also, remove the unused UDF_PATH_LEN constant. Signed-off-by: Andrew Gabbasov Signed-off-by: Jan Kara --- fs/udf/namei.c | 10 +++++----- fs/udf/super.c | 2 +- fs/udf/udfdecl.h | 6 +++--- fs/udf/unicode.c | 6 +++--- 4 files changed, 12 insertions(+), 12 deletions(-) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index f82c70d73aba..9eb9c6440270 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -291,7 +291,7 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, struct udf_fileident_bh fibh; struct fileIdentDesc *fi; - if (dentry->d_name.len > UDF_NAME_LEN - 2) + if (dentry->d_name.len > UDF_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); #ifdef UDF_RECOVERY @@ -351,7 +351,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir, struct udf_inode_info *dinfo; fibh->sbh = fibh->ebh = NULL; - name = kmalloc(UDF_NAME_LEN, GFP_NOFS); + name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); if (!name) { *err = -ENOMEM; goto out_err; @@ -364,7 +364,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir, } namelen = udf_put_filename(sb, dentry->d_name.name, dentry->d_name.len, - name, UDF_NAME_LEN); + name, UDF_NAME_LEN_CS0); if (!namelen) { *err = -ENAMETOOLONG; goto out_err; @@ -915,7 +915,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, iinfo = UDF_I(inode); down_write(&iinfo->i_data_sem); - name = kmalloc(UDF_NAME_LEN, GFP_NOFS); + name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); if (!name) { err = -ENOMEM; goto out_no_entry; @@ -1000,7 +1000,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, if (pc->componentType == 5) { namelen = udf_put_filename(sb, compstart, symname - compstart, - name, UDF_NAME_LEN); + name, UDF_NAME_LEN_CS0); if (!namelen) goto out_no_entry; diff --git a/fs/udf/super.c b/fs/udf/super.c index a522c15a0bfd..ffb35f7eab38 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -2358,7 +2358,7 @@ static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) le32_to_cpu(lvidiu->numDirs)) : 0) + buf->f_bfree; buf->f_ffree = buf->f_bfree; - buf->f_namelen = UDF_NAME_LEN - 2; + buf->f_namelen = UDF_NAME_LEN; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h index 4a47c7267614..47a228248c5b 100644 --- a/fs/udf/udfdecl.h +++ b/fs/udf/udfdecl.h @@ -49,8 +49,8 @@ extern __printf(3, 4) void _udf_warn(struct super_block *sb, #define UDF_EXTENT_FLAG_MASK 0xC0000000 #define UDF_NAME_PAD 4 -#define UDF_NAME_LEN 256 -#define UDF_PATH_LEN 1023 +#define UDF_NAME_LEN 254 +#define UDF_NAME_LEN_CS0 255 static inline size_t udf_file_entry_alloc_offset(struct inode *inode) { @@ -108,7 +108,7 @@ struct generic_desc { struct ustr { uint8_t u_cmpID; - uint8_t u_name[UDF_NAME_LEN - 2]; + uint8_t u_name[UDF_NAME_LEN]; uint8_t u_len; }; diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c index 4d7a674ebce5..5599e7535401 100644 --- a/fs/udf/unicode.c +++ b/fs/udf/unicode.c @@ -33,7 +33,7 @@ static int udf_translate_to_linux(uint8_t *, int, uint8_t *, int, uint8_t *, static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen) { - if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN - 2)) + if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN)) return 0; memset(dest, 0, sizeof(struct ustr)); @@ -184,14 +184,14 @@ static int udf_name_from_CS0(struct ustr *utf_o, ocu = ocu_i->u_name; utf_o->u_len = 0; - for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) { + for (i = 0; (i < ocu_len) && (utf_o->u_len < UDF_NAME_LEN);) { /* Expand OSTA compressed Unicode to Unicode */ uint32_t c = ocu[i++]; if (cmp_id == 16) c = (c << 8) | ocu[i++]; len = conv_f(c, &utf_o->u_name[utf_o->u_len], - UDF_NAME_LEN - 2 - utf_o->u_len); + UDF_NAME_LEN - utf_o->u_len); /* Valid character? */ if (len >= 0) utf_o->u_len += len; -- GitLab