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liblzma: index.c: Define STREAMS_MAX

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Lasse Collin 2026-08-09 16:11:03 +03:00
parent 93372479ec
commit d31b473917
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1 changed files with 9 additions and 3 deletions
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src/liblzma/common/index.c
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@ -14,6 +14,14 @@
#include "stream_flags_common.h" #include "stream_flags_common.h"
/// \brief Maximum number of Streams supported in lzma_index
///
/// The maximum number of Streams is UINT32_MAX, because index_tree.count
/// is uint32_t. This is unlikely to be reached in practice because it
/// would require allocating hundreds of gigabytes of memory.
#define STREAMS_MAX UINT32_MAX
/// \brief How many Records to allocate at once /// \brief How many Records to allocate at once
/// ///
/// This should be big enough to avoid making lots of tiny allocations /// This should be big enough to avoid making lots of tiny allocations
@ -494,10 +502,8 @@ lzma_index_memusage(lzma_vli streams, lzma_vli blocks)
const uint64_t index_base = sizeof(lzma_index) + alloc_overhead; const uint64_t index_base = sizeof(lzma_index) + alloc_overhead;
// Validate the arguments and catch integer overflows. // Validate the arguments and catch integer overflows.
// Maximum number of Streams is "only" UINT32_MAX, because
// that limit is used by the tree containing the Streams.
const uint64_t limit = UINT64_MAX - index_base; const uint64_t limit = UINT64_MAX - index_base;
if (streams == 0 || streams > UINT32_MAX || blocks > LZMA_VLI_MAX if (streams == 0 || streams > STREAMS_MAX || blocks > LZMA_VLI_MAX
|| streams > limit / stream_base || streams > limit / stream_base
|| groups > limit / group_base || groups > limit / group_base
|| limit - streams_mem < groups_mem) || limit - streams_mem < groups_mem)