ext4: Fix memory and buffer head leak in callers to ext4_ext_find_extent()
The path variable returned via ext4_ext_find_extent is a kmalloc variable and needs to be freeded. It also contains a reference to buffer_head which needs to be dropped. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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4cdeed861b
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b35905c16a
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@ -349,7 +349,7 @@ static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
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#define ext4_ext_show_leaf(inode,path)
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#endif
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static void ext4_ext_drop_refs(struct ext4_ext_path *path)
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void ext4_ext_drop_refs(struct ext4_ext_path *path)
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{
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int depth = path->p_depth;
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int i;
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@ -2200,10 +2200,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
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newdepth = ext_depth(inode);
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if (newdepth != depth) {
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depth = newdepth;
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path = ext4_ext_find_extent(inode, iblock, NULL);
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ext4_ext_drop_refs(path);
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path = ext4_ext_find_extent(inode, iblock, path);
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if (IS_ERR(path)) {
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err = PTR_ERR(path);
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path = NULL;
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goto out;
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}
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eh = path[depth].p_hdr;
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@ -43,6 +43,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
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if (IS_ERR(path)) {
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retval = PTR_ERR(path);
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path = NULL;
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goto err_out;
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}
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@ -74,6 +75,10 @@ static int finish_range(handle_t *handle, struct inode *inode,
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}
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retval = ext4_ext_insert_extent(handle, inode, path, &newext);
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err_out:
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if (path) {
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ext4_ext_drop_refs(path);
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kfree(path);
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}
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lb->first_pblock = 0;
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return retval;
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}
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@ -227,5 +227,6 @@ extern int ext4_ext_search_left(struct inode *, struct ext4_ext_path *,
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ext4_lblk_t *, ext4_fsblk_t *);
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extern int ext4_ext_search_right(struct inode *, struct ext4_ext_path *,
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ext4_lblk_t *, ext4_fsblk_t *);
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extern void ext4_ext_drop_refs(struct ext4_ext_path *);
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#endif /* _LINUX_EXT4_EXTENTS */
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