udf: Avoid accessing uninitialized data on failed inode read
When we fail to read inode, some data accessed in udf_evict_inode() may be uninitialized. Move the accesses to !is_bad_inode() branch. Reported-by: syzbot+91f02b28f9bb5f5f1341@syzkaller.appspotmail.com Signed-off-by: Jan Kara <jack@suse.cz>
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3d3dc274ce
Коммит
044e2e26f2
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@ -139,21 +139,24 @@ void udf_evict_inode(struct inode *inode)
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struct udf_inode_info *iinfo = UDF_I(inode);
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int want_delete = 0;
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if (!inode->i_nlink && !is_bad_inode(inode)) {
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want_delete = 1;
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udf_setsize(inode, 0);
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udf_update_inode(inode, IS_SYNC(inode));
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if (!is_bad_inode(inode)) {
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if (!inode->i_nlink) {
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want_delete = 1;
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udf_setsize(inode, 0);
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udf_update_inode(inode, IS_SYNC(inode));
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}
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if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
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inode->i_size != iinfo->i_lenExtents) {
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udf_warn(inode->i_sb,
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"Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
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inode->i_ino, inode->i_mode,
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(unsigned long long)inode->i_size,
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(unsigned long long)iinfo->i_lenExtents);
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}
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}
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truncate_inode_pages_final(&inode->i_data);
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invalidate_inode_buffers(inode);
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clear_inode(inode);
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if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
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inode->i_size != iinfo->i_lenExtents) {
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udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
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inode->i_ino, inode->i_mode,
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(unsigned long long)inode->i_size,
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(unsigned long long)iinfo->i_lenExtents);
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}
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kfree(iinfo->i_ext.i_data);
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iinfo->i_ext.i_data = NULL;
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udf_clear_extent_cache(inode);
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