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f2fs: fix to avoid NULL pointer dereference

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Unable to handle kernel NULL pointer dereference at virtual address 00000000
PC is at f2fs_free_dic+0x60/0x2c8
LR is at f2fs_decompress_pages+0x3c4/0x3e8
f2fs_free_dic+0x60/0x2c8
f2fs_decompress_pages+0x3c4/0x3e8
__read_end_io+0x78/0x19c
f2fs_post_read_work+0x6c/0x94
process_one_work+0x210/0x48c
worker_thread+0x2e8/0x44c
kthread+0x110/0x120
ret_from_fork+0x10/0x18

In f2fs_free_dic(), we can not use f2fs_put_page(,1) to release dic->tpages[i],
as the page's mapping is NULL.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-02-24 19:20:17 +08:00 committed by Jaegeuk Kim
parent 7fa6d59816
commit 61fbae2b2b
1 changed files with 2 additions and 1 deletions
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3
fs/f2fs/compress.c
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@ -1137,7 +1137,8 @@ void f2fs_free_dic(struct decompress_io_ctx *dic)
for (i = 0; i < dic->cluster_size; i++) {
if (dic->rpages[i])
continue;
f2fs_put_page(dic->tpages[i], 1);
unlock_page(dic->tpages[i]);
put_page(dic->tpages[i]);
}
kfree(dic->tpages);
}