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charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [erofs?] KMSAN: uninit-value in z_erofs_lz4_decompress (3) Author: eadavis@qq.com #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 021be5feb1bc..8ac3f96676c4 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -250,7 +250,8 @@ static int z_erofs_lz4_decompress_mem(struct z_erofs_lz4_decompress_ctx *ctx, print_hex_dump(KERN_DEBUG, "[ in]: ", DUMP_PREFIX_OFFSET, 16, 1, src + inputmargin, rq->inputsize, true); print_hex_dump(KERN_DEBUG, "[out]: ", DUMP_PREFIX_OFFSET, - 16, 1, out, rq->outputsize, true); + 16, 1, out, (ret < 0 && rq->inputsize > 0) ? + (ret + rq->inputsize) : rq->outputsize, true); if (ret >= 0) memset(out + ret, 0, rq->outputsize - ret);