From 4d06bfb97ecb0df4f5b057a73db002e28c22c35c Mon Sep 17 00:00:00 2001 From: Ritesh Harjani Date: Wed, 6 Nov 2019 15:08:09 +0530 Subject: [PATCH] ext4: Add error handling for io_end_vec struct allocation This patch adds the error handling in case of any memory allocation failure for io_end_vec. This was missing in original patch series which enables dioread_nolock for blocksize < pagesize. Fixes: c8cc88163f40 ("ext4: Add support for blocksize < pagesize in dioread_nolock") Reported-by: Dan Carpenter Signed-off-by: Ritesh Harjani Link: https://lore.kernel.org/r/20191106093809.10673-1-riteshh@linux.ibm.com Signed-off-by: Theodore Ts'o --- fs/ext4/inode.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 381813205f99..de70f19bfa7e 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2240,6 +2240,10 @@ static int mpage_process_page(struct mpage_da_data *mpd, struct page *page, err = 0; if (!err && mpd->map.m_len && mpd->map.m_lblk > lblk) { io_end_vec = ext4_alloc_io_end_vec(io_end); + if (IS_ERR(io_end_vec)) { + err = PTR_ERR(io_end_vec); + goto out; + } io_end_vec->offset = mpd->map.m_lblk << blkbits; } *map_bh = true; @@ -2405,8 +2409,11 @@ static int mpage_map_and_submit_extent(handle_t *handle, loff_t disksize; int progress = 0; ext4_io_end_t *io_end = mpd->io_submit.io_end; - struct ext4_io_end_vec *io_end_vec = ext4_alloc_io_end_vec(io_end); + struct ext4_io_end_vec *io_end_vec; + io_end_vec = ext4_alloc_io_end_vec(io_end); + if (IS_ERR(io_end_vec)) + return PTR_ERR(io_end_vec); io_end_vec->offset = ((loff_t)map->m_lblk) << inode->i_blkbits; do { err = mpage_map_one_extent(handle, mpd);