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igzip: Avoid UB pointer arithmetic underflow for virtual file start

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Change-Id: I95c0e6f004eaf70227a6419fc14bf0958d1f4538
Signed-off-by: Roy Oursler <roy.j.oursler@intel.com>
This commit is contained in:
Roy Oursler 2019-01-08 08:49:23 -07:00
parent 139fdb68b9
commit 53b92e83f4
3 changed files with 6 additions and 6 deletions
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4
igzip/igzip_base.c
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@ -35,7 +35,7 @@ void isal_deflate_body_base(struct isal_zstream *stream)
uint64_t code, code_len, code2, code_len2;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;
@ -123,7 +123,7 @@ void isal_deflate_finish_base(struct isal_zstream *stream)
uint64_t code, code_len, code2, code_len2;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;

6
igzip/igzip_icf_base.c
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@ -44,7 +44,7 @@ void isal_deflate_icf_body_hash_hist_base(struct isal_zstream *stream)
struct isal_zstate *state = &stream->internal_state;
struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
uint16_t *last_seen = level_buf->hash_hist.hash_table;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;
@ -141,7 +141,7 @@ void isal_deflate_icf_finish_hash_hist_base(struct isal_zstream *stream)
struct isal_zstate *state = &stream->internal_state;
struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
uint16_t *last_seen = level_buf->hash_hist.hash_table;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;
@ -252,7 +252,7 @@ void isal_deflate_icf_finish_hash_map_base(struct isal_zstream *stream)
struct isal_zstate *state = &stream->internal_state;
struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
uint16_t *last_seen = level_buf->hash_map.hash_table;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;

2
igzip/igzip_icf_body.c
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@ -77,7 +77,7 @@ uint64_t gen_icf_map_h1_base(struct isal_zstream *stream,
uint32_t dist, len, extra_bits;
uint8_t *next_in = stream->next_in, *end_in = stream->next_in + input_size;
uint8_t *file_start = stream->next_in - stream->total_in;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hash;
uint64_t next_bytes, match_bytes;
uint64_t match;