b3140ed863
This fixes issue #1224 - null pointer dereference in kernel in the IO path with large IO's issued Signed-off-by: Krzysztof Majzerowicz-Jaszcz <krzysztof.majzerowicz-jaszcz@intel.com>
89 lines
2.2 KiB
Bash
89 lines
2.2 KiB
Bash
#!/bin/bash
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#
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# Copyright(c) 2012-2021 Intel Corporation
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# SPDX-License-Identifier: BSD-3-Clause
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#
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. $(dirname $3)/conf_framework
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check() {
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cur_name=$(basename $2)
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config_file_path=$1
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if compile_module $cur_name "bio_split(NULL, 0, 0, 0);" "linux/bio.h"
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then
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echo $cur_name "1" >> $config_file_path
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elif compile_module $cur_name "bio_split(NULL, 0);" "linux/bio.h"
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then
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echo $cur_name "2" >> $config_file_path
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else
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echo $cur_name "X" >> $config_file_path
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fi
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}
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apply() {
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case "$1" in
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"1")
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add_function "
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static inline struct bio *cas_bio_split(struct bio *bio, int sectors)
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{
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return bio_split(bio, sectors, GFP_NOIO, &fs_bio_set);
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}" ;;
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"2")
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add_function "
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static inline struct bio *cas_bio_split(struct bio *bio, int sectors)
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{
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struct bio *split, copy;
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int bytes = sectors << 9;
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uint32_t idx, vecs = 0;
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int ret;
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copy = *bio;
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copy.bi_io_vec = ©.bi_io_vec[copy.bi_idx];
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copy.bi_vcnt -= copy.bi_idx;
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copy.bi_idx = 0;
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BUG_ON(bytes >= bio->bi_size);
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// For simplicity we assume that split is alligned.
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// Otherwise bvec modification would be required.
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while (bytes) {
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if (bytes >= bio_iovec_idx(©, vecs)->bv_len) {
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bytes -= bio_iovec_idx(©, vecs)->bv_len;
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vecs++;
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} else {
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vecs++;
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break;
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}
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}
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split = bio_alloc_bioset(GFP_NOIO, vecs, NULL);
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if (!split)
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return NULL;
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copy.bi_max_vecs = vecs;
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__bio_clone(split, ©);
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split->bi_size = sectors << 9;
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split->bi_vcnt = vecs;
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if (bio_integrity((©))) {
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ret = bio_integrity_clone(split, bio, GFP_NOIO);
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if (ret < 0) {
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bio_put(split);
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return NULL;
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}
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for (idx = 0, bytes = 0; idx < bio->bi_idx; idx++)
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bytes += bio_iovec_idx(bio, idx)->bv_len;
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bio_integrity_trim(split, bytes >> 9, sectors);
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}
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bio_advance(bio, split->bi_size);
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return split;
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}" ;;
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*)
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exit 1
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esac
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}
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conf_run $@
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