--- /dev/null
+++ b/crypto/unlzma.c
-@@ -0,0 +1,723 @@
+@@ -0,0 +1,775 @@
+/*
+ * LZMA uncompresion module for pcomp
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
+#include <linux/kthread.h>
+
+#include <crypto/internal/compress.h>
++#include <net/netlink.h>
+#include "unlzma.h"
+
+static int instance = 0;
+
+struct unlzma_buffer {
-+ struct unlzma_buffer *last;
+ int offset;
+ int size;
+ u8 *ptr;
+struct unlzma_ctx {
+ struct task_struct *thread;
+ wait_queue_head_t next_req;
++ wait_queue_head_t req_done;
+ struct mutex mutex;
++ bool waiting;
+ bool active;
+ bool cancel;
+
+ /* writer state */
+ u8 previous_byte;
+ ssize_t pos;
-+ struct unlzma_buffer *head;
+ int buf_full;
++ int n_buffers;
++ int buffers_max;
++ struct unlzma_buffer *buffers;
+
+ /* cstate */
+ int state;
+{
+ struct unlzma_buffer *bh;
+
-+ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
++ BUG_ON(ctx->n_buffers >= ctx->buffers_max);
++ bh = &ctx->buffers[ctx->n_buffers++];
+ bh->ptr = ctx->next_out;
+ bh->offset = ctx->pos;
-+ bh->last = ctx->head;
+ bh->size = ctx->avail_out;
-+ ctx->head = bh;
+ ctx->buf_full = 0;
+}
+
+unlzma_request_buffer(struct unlzma_ctx *ctx, int *avail)
+{
+ do {
++ ctx->waiting = true;
+ mutex_unlock(&ctx->mutex);
++ wake_up(&ctx->req_done);
+ if (wait_event_interruptible(ctx->next_req,
+ unlzma_should_stop(ctx) || (*avail > 0)))
+ schedule();
+static u8
+peek_old_byte(struct unlzma_ctx *ctx, u32 offs)
+{
-+ struct unlzma_buffer *bh = ctx->head;
++ struct unlzma_buffer *bh = &ctx->buffers[ctx->n_buffers - 1];
++ int i = ctx->n_buffers;
+ u32 pos;
+
-+ pos = ctx->pos - offs;
-+ if (pos >= ctx->dict_size) {
-+ pos = (~pos % ctx->dict_size);
++ if (!ctx->n_buffers) {
++ printk(KERN_ERR "unlzma/%s: no buffer\n", __func__);
++ goto error;
+ }
+
++ pos = ctx->pos - offs;
++ if (unlikely(pos >= ctx->dict_size))
++ pos = ~pos & (ctx->dict_size - 1);
++
+ while (bh->offset > pos) {
-+ bh = bh->last;
-+ BUG_ON(!bh);
++ bh--;
++ i--;
++ if (!i) {
++ printk(KERN_ERR "unlzma/%s: position %d out of range\n", __func__, pos);
++ goto error;
++ }
+ }
+
+ pos -= bh->offset;
-+ BUG_ON(pos >= bh->size);
++ if (pos >= bh->size) {
++ printk(KERN_ERR "unlzma/%s: position %d out of range\n", __func__, pos);
++ goto error;
++ }
+
+ return bh->ptr[pos];
++
++error:
++ ctx->cancel = true;
++ return 0;
+}
+
+static void
+ hdr_buf[i] = rc_read(ctx);
+ }
+
++ ctx->n_buffers = 0;
+ ctx->pos = 0;
+ get_buffer(ctx);
+ ctx->active = true;
+ unlzma_reset_buf(ctx);
+ ctx->cancel = false;
+ ctx->active = false;
-+ while (ctx->head) {
-+ struct unlzma_buffer *bh = ctx->head;
-+ ctx->head = bh->last;
-+ kfree(bh);
-+ }
+ } while (!kthread_should_stop());
+ mutex_unlock(&ctx->mutex);
+ return 0;
+ unlzma_cancel(ctx);
+ kthread_stop(ctx->thread);
+ ctx->thread = NULL;
++ if (ctx->buffers)
++ kfree(ctx->buffers);
++ ctx->buffers_max = 0;
++ ctx->buffers = NULL;
+ }
+}
+
+unlzma_decompress_setup(struct crypto_pcomp *tfm, void *p, unsigned int len)
+{
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++ struct nlattr *tb[UNLZMA_DECOMP_MAX + 1];
+ int ret = 0;
+
+ if (ctx->thread)
-+ return 0;
++ return -EINVAL;
++
++ if (!p)
++ return -EINVAL;
+
++ ret = nla_parse(tb, UNLZMA_DECOMP_MAX, p, len, NULL);
++ if (ret)
++ return ret;
++
++ if (!tb[UNLZMA_DECOMP_OUT_BUFFERS])
++ return -EINVAL;
++
++ if (ctx->buffers_max && (ctx->buffers_max <
++ nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]))) {
++ kfree(ctx->buffers);
++ ctx->buffers_max = 0;
++ ctx->buffers = NULL;
++ }
++ if (!ctx->buffers) {
++ ctx->buffers_max = nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]);
++ ctx->buffers = kzalloc(sizeof(struct unlzma_buffer) * ctx->buffers_max, GFP_KERNEL);
++ }
++ if (!ctx->buffers)
++ return -ENOMEM;
++
++ ctx->waiting = false;
+ mutex_init(&ctx->mutex);
+ init_waitqueue_head(&ctx->next_req);
++ init_waitqueue_head(&ctx->req_done);
+ ctx->thread = kthread_run(unlzma_thread, ctx, "unlzma/%d", instance++);
+ if (IS_ERR(ctx->thread)) {
+ ret = PTR_ERR(ctx->thread);
+static int
+unlzma_decompress_init(struct crypto_pcomp *tfm)
+{
-+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
-+
-+ ctx->pos = 0;
+ return 0;
+}
+
+static void
+unlzma_wait_complete(struct unlzma_ctx *ctx, bool finish)
+{
++ DEFINE_WAIT(__wait);
++
+ do {
-+ mutex_unlock(&ctx->mutex);
+ wake_up(&ctx->next_req);
++ prepare_to_wait(&ctx->req_done, &__wait, TASK_INTERRUPTIBLE);
++ mutex_unlock(&ctx->mutex);
+ schedule();
+ mutex_lock(&ctx->mutex);
-+ } while (ctx->active && (ctx->avail_in > 0) && (ctx->avail_out > 0));
++ } while (!ctx->waiting && ctx->active);
++ finish_wait(&ctx->req_done, &__wait);
+}
+
+static int
+ goto out;
+
+ pos = ctx->pos;
++ ctx->waiting = false;
+ ctx->next_in = req->next_in;
+ ctx->avail_in = req->avail_in;
+ ctx->next_out = req->next_out;
+
+out:
+ mutex_unlock(&ctx->mutex);
++ if (ctx->cancel)
++ return -EINVAL;
++
+ return pos;
+}
+
+#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
+
+#endif
+--- a/include/crypto/compress.h
++++ b/include/crypto/compress.h
+@@ -49,6 +49,12 @@ enum zlib_decomp_params {
+
+ #define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)
+
++enum unlzma_decomp_params {
++ UNLZMA_DECOMP_OUT_BUFFERS = 1, /* naximum number of output buffers */
++ __UNLZMA_DECOMP_MAX,
++};
++#define UNLZMA_DECOMP_MAX (__UNLZMA_DECOMP_MAX - 1)
++
+
+ struct crypto_pcomp {
+ struct crypto_tfm base;
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