udf: Remove declarations of arrays of size UDF_NAME_LEN (256 bytes)
There are several places in UDF where we declared temporary arrays of
UDF_NAME_LEN bytes on stack. This is not nice to stack usage so this patch
changes those places to use kmalloc() instead. Also clean up bail-out paths
in those functions when we are changing them.
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index 31feef9..62dc270 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -39,13 +39,13 @@
static int do_udf_readdir(struct inode *dir, struct file *filp,
filldir_t filldir, void *dirent)
{
- struct udf_fileident_bh fibh;
+ struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
struct fileIdentDesc *fi = NULL;
struct fileIdentDesc cfi;
int block, iblock;
loff_t nf_pos = (filp->f_pos - 1) << 2;
int flen;
- char fname[UDF_NAME_LEN];
+ char *fname = NULL;
char *nameptr;
uint16_t liu;
uint8_t lfi;
@@ -54,23 +54,32 @@
kernel_lb_addr eloc;
uint32_t elen;
sector_t offset;
- int i, num;
+ int i, num, ret = 0;
unsigned int dt_type;
struct extent_position epos = { NULL, 0, {0, 0} };
struct udf_inode_info *iinfo;
if (nf_pos >= size)
- return 0;
+ goto out;
+
+ fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+ if (!fname) {
+ ret = -ENOMEM;
+ goto out;
+ }
if (nf_pos == 0)
nf_pos = udf_ext0_offset(dir);
fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
iinfo = UDF_I(dir);
- if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
- fibh.sbh = fibh.ebh = NULL;
- } else if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
- &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
+ if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+ if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
+ &epos, &eloc, &elen, &offset)
+ != (EXT_RECORDED_ALLOCATED >> 30)) {
+ ret = -ENOENT;
+ goto out;
+ }
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
@@ -83,8 +92,8 @@
}
if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
- brelse(epos.bh);
- return -EIO;
+ ret = -EIO;
+ goto out;
}
if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
@@ -105,9 +114,6 @@
brelse(bha[i]);
}
}
- } else {
- brelse(epos.bh);
- return -ENOENT;
}
while (nf_pos < size) {
@@ -115,13 +121,8 @@
fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
&elen, &offset);
- if (!fi) {
- if (fibh.sbh != fibh.ebh)
- brelse(fibh.ebh);
- brelse(fibh.sbh);
- brelse(epos.bh);
- return 0;
- }
+ if (!fi)
+ goto out;
liu = le16_to_cpu(cfi.lengthOfImpUse);
lfi = cfi.lengthFileIdent;
@@ -167,25 +168,21 @@
dt_type = DT_UNKNOWN;
}
- if (flen) {
- if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0) {
- if (fibh.sbh != fibh.ebh)
- brelse(fibh.ebh);
- brelse(fibh.sbh);
- brelse(epos.bh);
- return 0;
- }
- }
+ if (flen && filldir(dirent, fname, flen, filp->f_pos,
+ iblock, dt_type) < 0)
+ goto out;
} /* end while */
filp->f_pos = (nf_pos >> 2) + 1;
+out:
if (fibh.sbh != fibh.ebh)
brelse(fibh.ebh);
brelse(fibh.sbh);
brelse(epos.bh);
+ kfree(fname);
- return 0;
+ return ret;
}
static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)