6.6-stable review patch. If anyone has any objections, please let me know.
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From: Chao Yu chao@kernel.org
[ Upstream commit b0327c84e91a0f4f0abced8cb83ec86a7083f086 ]
Call trace: __memcpy+0x128/0x250 f2fs_read_multi_pages+0x940/0xf7c f2fs_mpage_readpages+0x5a8/0x624 f2fs_readahead+0x5c/0x110 page_cache_ra_unbounded+0x1b8/0x590 do_sync_mmap_readahead+0x1dc/0x2e4 filemap_fault+0x254/0xa8c f2fs_filemap_fault+0x2c/0x104 __do_fault+0x7c/0x238 do_handle_mm_fault+0x11bc/0x2d14 do_mem_abort+0x3a8/0x1004 el0_da+0x3c/0xa0 el0t_64_sync_handler+0xc4/0xec el0t_64_sync+0x1b4/0x1b8
In f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if we hit cached page in compress_inode's cache, dic may be released, it needs break the loop rather than continuing it, in order to avoid accessing invalid dic pointer.
Fixes: 6ce19aff0b8c ("f2fs: compress: add compress_inode to cache compressed blocks") Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/data.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 3f33e14dc7f81..1ac34eb49a0e8 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2344,8 +2344,10 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret, f2fs_wait_on_block_writeback(inode, blkaddr);
if (f2fs_load_compressed_page(sbi, page, blkaddr)) { - if (atomic_dec_and_test(&dic->remaining_pages)) + if (atomic_dec_and_test(&dic->remaining_pages)) { f2fs_decompress_cluster(dic, true); + break; + } continue; }