[PATCH v2] fs/ntfs3: Fix memory leak if fill_super failed
From: Konstantin Komarov
Date: Tue Oct 05 2021 - 11:27:00 EST
In ntfs_init_fs_context we allocate memory in fc->s_fs_info.
In case of failed mount we must free it in ntfs_fill_super.
We can't do it in ntfs_fs_free, because ntfs_fs_free called
with fc->s_fs_info == NULL.
fc->s_fs_info became NULL in sget_fc.
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
---
v2:
Changed fix - now we free memory instead of restoring pointer to memory.
Added context how we allocate and free memory.
Many commits affected, so no fixes tag.
fs/ntfs3/super.c | 90 ++++++++++++++++++++++++++++++------------------
1 file changed, 56 insertions(+), 34 deletions(-)
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 705d8b4f4894..d41d76979e12 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -908,7 +908,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (IS_ERR(sbi->options->nls)) {
sbi->options->nls = NULL;
errorf(fc, "Cannot load nls %s", sbi->options->nls_name);
- return -EINVAL;
+ err = -EINVAL;
+ goto out;
}
rq = bdev_get_queue(bdev);
@@ -922,7 +923,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
err = ntfs_init_from_boot(sb, rq ? queue_logical_block_size(rq) : 512,
bdev->bd_inode->i_size);
if (err)
- return err;
+ goto out;
/*
* Load $Volume. This should be done before $LogFile
@@ -933,7 +934,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $Volume.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
ni = ntfs_i(inode);
@@ -954,19 +956,19 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
} else {
/* Should we break mounting here? */
//err = -EINVAL;
- //goto out;
+ //goto put_inode_out;
}
attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
if (!attr || is_attr_ext(attr)) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO);
if (!info) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
sbi->volume.major_ver = info->major_ver;
@@ -980,7 +982,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $MFTMirr.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
sbi->mft.recs_mirr =
@@ -994,14 +997,15 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load \x24LogFile.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
ni = ntfs_i(inode);
err = ntfs_loadlog_and_replay(ni, sbi);
if (err)
- goto out;
+ goto put_inode_out;
iput(inode);
@@ -1009,14 +1013,16 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (!sb_rdonly(sb)) {
ntfs_warn(sb,
"failed to replay log file. Can't mount rw!");
- return -EINVAL;
+ err = -EINVAL;
+ goto out;
}
} else if (sbi->volume.flags & VOLUME_FLAG_DIRTY) {
if (!sb_rdonly(sb) && !sbi->options->force) {
ntfs_warn(
sb,
"volume is dirty and \"force\" flag is not set!");
- return -EINVAL;
+ err = -EINVAL;
+ goto out;
}
}
@@ -1027,7 +1033,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_MFT);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $MFT.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
ni = ntfs_i(inode);
@@ -1038,11 +1045,11 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
err = wnd_init(&sbi->mft.bitmap, sb, tt);
if (err)
- goto out;
+ goto put_inode_out;
err = ni_load_all_mi(ni);
if (err)
- goto out;
+ goto put_inode_out;
sbi->mft.ni = ni;
@@ -1052,7 +1059,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $BadClus.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
ni = ntfs_i(inode);
@@ -1075,13 +1083,14 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $Bitmap.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
if (inode->i_size >> 32) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
#endif
@@ -1089,21 +1098,21 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
tt = sbi->used.bitmap.nbits;
if (inode->i_size < bitmap_size(tt)) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
/* Not necessary. */
sbi->used.bitmap.set_tail = true;
err = wnd_init(&sbi->used.bitmap, sb, tt);
if (err)
- goto out;
+ goto put_inode_out;
iput(inode);
/* Compute the MFT zone. */
err = ntfs_refresh_zone(sbi);
if (err)
- return err;
+ goto out;
/* Load $AttrDef. */
ref.low = cpu_to_le32(MFT_REC_ATTR);
@@ -1111,18 +1120,19 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $AttrDef -> %d", err);
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY)) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
bytes = inode->i_size;
sbi->def_table = t = kmalloc(bytes, GFP_NOFS);
if (!t) {
err = -ENOMEM;
- goto out;
+ goto put_inode_out;
}
for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
@@ -1131,7 +1141,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (IS_ERR(page)) {
err = PTR_ERR(page);
- goto out;
+ goto put_inode_out;
}
memcpy(Add2Ptr(t, done), page_address(page),
min(PAGE_SIZE, tail));
@@ -1139,7 +1149,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (!idx && ATTR_STD != t->type) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
}
@@ -1173,12 +1183,13 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load $UpCase.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
if (inode->i_size != 0x10000 * sizeof(short)) {
err = -EINVAL;
- goto out;
+ goto put_inode_out;
}
for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
@@ -1188,7 +1199,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (IS_ERR(page)) {
err = PTR_ERR(page);
- goto out;
+ goto put_inode_out;
}
src = page_address(page);
@@ -1214,7 +1225,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
/* Load $Secure. */
err = ntfs_security_init(sbi);
if (err)
- return err;
+ goto out;
/* Load $Extend. */
err = ntfs_extend_init(sbi);
@@ -1239,19 +1250,30 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
if (IS_ERR(inode)) {
ntfs_err(sb, "Failed to load root.");
- return PTR_ERR(inode);
+ err = PTR_ERR(inode);
+ goto out;
}
sb->s_root = d_make_root(inode);
- if (!sb->s_root)
- return -ENOMEM;
+ if (!sb->s_root) {
+ err = -ENOMEM;
+ goto put_inode_out;
+ }
fc->fs_private = NULL;
- fc->s_fs_info = NULL;
return 0;
-out:
+
+put_inode_out:
iput(inode);
+out:
+ /*
+ * Free resources here.
+ * ntfs_fs_free will be called with fc->s_fs_info = NULL
+ */
+ put_ntfs(sbi);
+ sb->s_fs_info = NULL;
+
return err;
}
--
2.33.0