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liblzma: Refactor to use lzma_filters_free(). 

lzma_filters_free() sets the options to NULL and ids to
LZMA_VLI_UNKNOWN so there is no need to do it by caller;
the filter arrays will always be left in a safe state.

Also use memcpy() instead of a loop to copy a filter chain
when it is known to be safe to copy LZMA_FILTERS_MAX + 1
(even if the elements past the terminator might be uninitialized).
This commit is contained in:
Lasse Collin 2022-11-24 01:32:16 +02:00
parent cb05dbcf8b
commit e1acf71072
2 changed files with 6 additions and 21 deletions
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16
src/liblzma/common/stream_encoder.c
View File

@ -219,8 +219,7 @@ stream_encoder_end(void *coder_ptr, const lzma_allocator *allocator)
lzma_next_end(&coder->index_encoder, allocator); lzma_next_end(&coder->index_encoder, allocator);
lzma_index_end(coder->index, allocator); lzma_index_end(coder->index, allocator);
for (size_t i = 0; coder->filters[i].id != LZMA_VLI_UNKNOWN; ++i) lzma_filters_free(coder->filters, allocator);
lzma_free(coder->filters[i].options, allocator);
lzma_free(coder, allocator); lzma_free(coder, allocator);
return; return;
@ -271,22 +270,15 @@ stream_encoder_update(void *coder_ptr, const lzma_allocator *allocator,
} }
// Free the options of the old chain. // Free the options of the old chain.
for (size_t i = 0; coder->filters[i].id != LZMA_VLI_UNKNOWN; ++i) lzma_filters_free(coder->filters, allocator);
lzma_free(coder->filters[i].options, allocator);
// Copy the new filter chain in place. // Copy the new filter chain in place.
size_t j = 0; memcpy(coder->filters, temp, sizeof(temp));
do {
coder->filters[j].id = temp[j].id;
coder->filters[j].options = temp[j].options;
} while (temp[j++].id != LZMA_VLI_UNKNOWN);
return LZMA_OK; return LZMA_OK;
error: error:
for (size_t i = 0; temp[i].id != LZMA_VLI_UNKNOWN; ++i) lzma_filters_free(temp, allocator);
lzma_free(temp[i].options, allocator);
return ret; return ret;
} }

11
src/liblzma/common/stream_encoder_mt.c
View File

@ -866,8 +866,7 @@ stream_encoder_mt_end(void *coder_ptr, const lzma_allocator *allocator)
threads_end(coder, allocator); threads_end(coder, allocator);
lzma_outq_end(&coder->outq, allocator); lzma_outq_end(&coder->outq, allocator);
for (size_t i = 0; coder->filters[i].id != LZMA_VLI_UNKNOWN; ++i) lzma_filters_free(coder->filters, allocator);
lzma_free(coder->filters[i].options, allocator);
lzma_next_end(&coder->index_encoder, allocator); lzma_next_end(&coder->index_encoder, allocator);
lzma_index_end(coder->index, allocator); lzma_index_end(coder->index, allocator);
@ -1068,13 +1067,7 @@ stream_encoder_mt_init(lzma_next_coder *next, const lzma_allocator *allocator,
coder->timeout = options->timeout; coder->timeout = options->timeout;
// Free the old filter chain and copy the new one. // Free the old filter chain and copy the new one.
for (size_t i = 0; coder->filters[i].id != LZMA_VLI_UNKNOWN; ++i) lzma_filters_free(coder->filters, allocator);
lzma_free(coder->filters[i].options, allocator);
// Mark it as empty so that it is in a safe state in case
// lzma_filters_copy() fails.
coder->filters[0].id = LZMA_VLI_UNKNOWN;
return_if_error(lzma_filters_copy( return_if_error(lzma_filters_copy(
filters, coder->filters, allocator)); filters, coder->filters, allocator));