diff options
| -rw-r--r-- | lib/decompress_unlzma.c | 53 |
1 files changed, 32 insertions, 21 deletions
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c index 4281aa9cb76c..f30c899241ef 100644 --- a/lib/decompress_unlzma.c +++ b/lib/decompress_unlzma.c @@ -313,32 +313,38 @@ static inline uint8_t INIT peek_old_byte(struct writer *wr, } -static inline void INIT write_byte(struct writer *wr, uint8_t byte) +static inline int INIT write_byte(struct writer *wr, uint8_t byte) { wr->buffer[wr->buffer_pos++] = wr->previous_byte = byte; if (wr->flush && wr->buffer_pos == wr->header->dict_size) { wr->buffer_pos = 0; wr->global_pos += wr->header->dict_size; - wr->flush((char *)wr->buffer, wr->header->dict_size); + if (wr->flush((char *)wr->buffer, wr->header->dict_size) + != wr->header->dict_size) + return -1; } + return 0; } -static inline void INIT copy_byte(struct writer *wr, uint32_t offs) +static inline int INIT copy_byte(struct writer *wr, uint32_t offs) { - write_byte(wr, peek_old_byte(wr, offs)); + return write_byte(wr, peek_old_byte(wr, offs)); } -static inline void INIT copy_bytes(struct writer *wr, +static inline int INIT copy_bytes(struct writer *wr, uint32_t rep0, int len) { do { - copy_byte(wr, rep0); + if (copy_byte(wr, rep0)) + return -1; len--; } while (len != 0 && wr->buffer_pos < wr->header->dst_size); + + return len; } -static inline void INIT process_bit0(struct writer *wr, struct rc *rc, +static inline int INIT process_bit0(struct writer *wr, struct rc *rc, struct cstate *cst, uint16_t *p, int pos_state, uint16_t *prob, int lc, uint32_t literal_pos_mask) { @@ -372,16 +378,17 @@ static inline void INIT process_bit0(struct writer *wr, struct rc *rc, uint16_t *prob_lit = prob + mi; rc_get_bit(rc, prob_lit, &mi); } - write_byte(wr, mi); if (cst->state < 4) cst->state = 0; else if (cst->state < 10) cst->state -= 3; else cst->state -= 6; + + return write_byte(wr, mi); } -static inline void INIT process_bit1(struct writer *wr, struct rc *rc, +static inline int INIT process_bit1(struct writer *wr, struct rc *rc, struct cstate *cst, uint16_t *p, int pos_state, uint16_t *prob) { int offset; @@ -412,8 +419,7 @@ static inline void INIT process_bit1(struct writer *wr, struct rc *rc, cst->state = cst->state < LZMA_NUM_LIT_STATES ? 9 : 11; - copy_byte(wr, cst->rep0); - return; + return copy_byte(wr, cst->rep0); } else { rc_update_bit_1(rc, prob); } @@ -515,12 +521,12 @@ static inline void INIT process_bit1(struct writer *wr, struct rc *rc, } else cst->rep0 = pos_slot; if (++(cst->rep0) == 0) - return; + return 0; } len += LZMA_MATCH_MIN_LEN; - copy_bytes(wr, cst->rep0, len); + return copy_bytes(wr, cst->rep0, len); } @@ -623,11 +629,17 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len, int pos_state = get_pos(&wr) & pos_state_mask; uint16_t *prob = p + LZMA_IS_MATCH + (cst.state << LZMA_NUM_POS_BITS_MAX) + pos_state; - if (rc_is_bit_0(&rc, prob)) - process_bit0(&wr, &rc, &cst, p, pos_state, prob, - lc, literal_pos_mask); - else { - process_bit1(&wr, &rc, &cst, p, pos_state, prob); + if (rc_is_bit_0(&rc, prob)) { + if (process_bit0(&wr, &rc, &cst, p, pos_state, prob, + lc, literal_pos_mask)) { + error("LZMA data is corrupt"); + goto exit_3; + } + } else { + if (process_bit1(&wr, &rc, &cst, p, pos_state, prob)) { + error("LZMA data is corrupt"); + goto exit_3; + } if (cst.rep0 == 0) break; } @@ -637,9 +649,8 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len, if (posp) *posp = rc.ptr-rc.buffer; - if (wr.flush) - wr.flush(wr.buffer, wr.buffer_pos); - ret = 0; + if (!wr.flush || wr.flush(wr.buffer, wr.buffer_pos) == wr.buffer_pos) + ret = 0; exit_3: large_free(p); exit_2: |