/* * uncompress.c * * (C) Copyright 1999 Linus Torvalds * * cramfs interfaces to the uncompression library. There's really just * three entrypoints: * * - cramfs_uncompress_init() - called to initialize the thing. * - cramfs_uncompress_exit() - tell me when you're done * - cramfs_uncompress_block() - uncompress a block. * * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We * only have one stream, and we'll initialize it only once even if it * then is used by multiple filesystems. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include "internal.h" static z_stream stream; static int initialized; /* Returns length of decompressed data. */ int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen) { int err; stream.next_in = src; stream.avail_in = srclen; stream.next_out = dst; stream.avail_out = dstlen; err = zlib_inflateReset(&stream); if (err != Z_OK) { pr_err("zlib_inflateReset error %d\n", err); zlib_inflateEnd(&stream); zlib_inflateInit(&stream); } err = zlib_inflate(&stream, Z_FINISH); if (err != Z_STREAM_END) goto err; return stream.total_out; err: pr_err("Error %d while decompressing!\n", err); pr_err("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen); return -EIO; } int cramfs_uncompress_init(void) { if (!initialized++) { stream.workspace = vmalloc(zlib_inflate_workspacesize()); if (!stream.workspace) { initialized = 0; return -ENOMEM; } stream.next_in = NULL; stream.avail_in = 0; zlib_inflateInit(&stream); } return 0; } void cramfs_uncompress_exit(void) { if (!--initialized) { zlib_inflateEnd(&stream); vfree(stream.workspace); } } /linux/net-next.git/log/net/openvswitch?h=nds-private-remove'>logtreecommitdiff
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authorChristoph Hellwig <hch@lst.de>2017-01-24 14:50:19 +0100
committerJens Axboe <axboe@fb.com>2017-01-24 07:55:53 -0700
commit690e5325b8c7d5db05fc569c0f7b888bb4248272 (patch)
treeb9c39916a4397b1eb628e07e4fc6aff91219e393 /net/openvswitch
parenta4685d2f58e2230d4e27fb2ee581d7ea35e5d046 (diff)
block: fix use after free in __blkdev_direct_IO
We can't dereference the dio structure after submitting the last bio for this request, as I/O completion might have happened before the code is run. Introduce a local is_sync variable instead. Fixes: 542ff7bf ("block: new direct I/O implementation") Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Matias Bjørling <m@bjorling.me> Tested-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/openvswitch')