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udf: Get rid of 0-length arrays in struct fileIdentDesc

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Get rid of 0-length arrays in struct fileIdentDesc. This requires a bit
of cleaning up as the second variable length array in this structure is
often used and the code abuses the fact that the first two arrays have
the same type and offset in struct fileIdentDesc.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2021-05-03 11:54:24 +02:00
parent b3c8c9801e
commit 979a6e28dd
5 changed files with 16 additions and 15 deletions
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5
fs/udf/dir.c
View File

@ -35,7 +35,6 @@
#include "udf_i.h"
#include "udf_sb.h"
static int udf_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *dir = file_inode(file);
@ -135,7 +134,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
lfi = cfi.lengthFileIdent;
if (fibh.sbh == fibh.ebh) {
nameptr = fi->fileIdent + liu;
nameptr = udf_get_fi_ident(fi);
} else {
int poffset; /* Unpaded ending offset */
@ -153,7 +152,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
}
}
nameptr = copy_name;
memcpy(nameptr, fi->fileIdent + liu,
memcpy(nameptr, udf_get_fi_ident(fi),
lfi - poffset);
memcpy(nameptr + lfi - poffset,
fibh.ebh->b_data, poffset);

6
fs/udf/ecma_167.h
View File

@ -471,9 +471,9 @@ struct fileIdentDesc {
uint8_t lengthFileIdent;
struct long_ad icb;
__le16 lengthOfImpUse;
uint8_t impUse[0];
uint8_t fileIdent[0];
uint8_t padding[0];
uint8_t impUse[];
/* uint8_t fileIdent[]; */
/* uint8_t padding[]; */
} __packed;
/* File Characteristics (ECMA 167r3 4/14.4.3) */

3
fs/udf/inode.c
View File

@ -390,8 +390,7 @@ struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
sfi->fileIdent +
le16_to_cpu(sfi->lengthOfImpUse))) {
udf_get_fi_ident(sfi))) {
iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
brelse(dbh);
return NULL;

13
fs/udf/namei.c
View File

@ -74,12 +74,11 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
if (fileident) {
if (adinicb || (offset + lfi < 0)) {
memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
memcpy(udf_get_fi_ident(sfi), fileident, lfi);
} else if (offset >= 0) {
memcpy(fibh->ebh->b_data + offset, fileident, lfi);
} else {
memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
-offset);
memcpy(udf_get_fi_ident(sfi), fileident, -offset);
memcpy(fibh->ebh->b_data, fileident - offset,
lfi + offset);
}
@ -88,11 +87,11 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
offset += lfi;
if (adinicb || (offset + padlen < 0)) {
memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
memset(udf_get_fi_ident(sfi) + lfi, 0x00, padlen);
} else if (offset >= 0) {
memset(fibh->ebh->b_data + offset, 0x00, padlen);
} else {
memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
memset(udf_get_fi_ident(sfi) + lfi, 0x00, -offset);
memset(fibh->ebh->b_data, 0x00, padlen + offset);
}
@ -226,7 +225,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
lfi = cfi->lengthFileIdent;
if (fibh->sbh == fibh->ebh) {
nameptr = fi->fileIdent + liu;
nameptr = udf_get_fi_ident(fi);
} else {
int poffset; /* Unpaded ending offset */
@ -246,7 +245,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
}
}
nameptr = copy_name;
memcpy(nameptr, fi->fileIdent + liu,
memcpy(nameptr, udf_get_fi_ident(fi),
lfi - poffset);
memcpy(nameptr + lfi - poffset,
fibh->ebh->b_data, poffset);

4
fs/udf/udfdecl.h
View File

@ -130,6 +130,10 @@ static inline unsigned int udf_dir_entry_len(struct fileIdentDesc *cfi)
le16_to_cpu(cfi->lengthOfImpUse) + cfi->lengthFileIdent,
UDF_NAME_PAD);
}
static inline uint8_t *udf_get_fi_ident(struct fileIdentDesc *fi)
{
return ((uint8_t *)(fi + 1)) + le16_to_cpu(fi->lengthOfImpUse);
}
/* file.c */
extern long udf_ioctl(struct file *, unsigned int, unsigned long);