mirror of https://gitee.com/openkylin/linux.git
f2fs: fix potential use-after-free issue
In error path of f2fs_read_multi_pages(), it should let last referrer
release decompress io context memory, otherwise, other referrer will
cause use-after-free issue.
Fixes: 4c8ff7095b
("f2fs: support data compression")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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parent
03382f1aa9
commit
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@ -2208,16 +2208,16 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
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page->index, for_write);
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if (IS_ERR(bio)) {
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ret = PTR_ERR(bio);
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bio = NULL;
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dic->failed = true;
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if (refcount_sub_and_test(dic->nr_cpages - i,
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&dic->ref))
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&dic->ref)) {
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f2fs_decompress_end_io(dic->rpages,
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cc->cluster_size, true,
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false);
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f2fs_free_dic(dic);
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f2fs_free_dic(dic);
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}
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f2fs_put_dnode(&dn);
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*bio_ret = bio;
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*bio_ret = NULL;
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return ret;
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}
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}
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