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Add fbounds-safety annotations for code_lengths.

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Reasoning:

The compiler reported an error in `src/utils/huffman_utils.c` at line
230 because the array parameter `code_lengths` decayed to a `__single`
pointer, which disallows pointer arithmetic. The parameter
`code_lengths_size` represents the size of the `code_lengths` array.
To fix this, the `code_lengths` parameter in the definition of
`VP8LBuildHuffmanTable` (line 230) and its declaration in
`src/utils/huffman_utils.h` (line 108) were annotated with
`WEBP_COUNTED_BY(code_lengths_size)`.

Bug: 432511821
Change-Id: Id0b32ca283bba5938320abbdbe61846e2d538c5d
This commit is contained in:
Arman Hasanzadeh
2025-08-15 10:08:16 -07:00
parent 3f96cbffa2
commit 15b1de13da
2 changed files with 7 additions and 5 deletions
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4
src/utils/huffman_utils.c
View File

@@ -227,7 +227,9 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
// Cut-off value for switching between heap and stack allocation.
#define SORTED_SIZE_CUTOFF 512
int VP8LBuildHuffmanTable(HuffmanTables* const root_table, int root_bits,
const int code_lengths[], int code_lengths_size) {
const int WEBP_COUNTED_BY(code_lengths_size)
code_lengths[],
int code_lengths_size) {
const int total_size =
BuildHuffmanTable(NULL, root_bits, code_lengths, code_lengths_size, NULL);
assert(code_lengths_size <= MAX_CODE_LENGTHS_SIZE);

8
src/utils/huffman_utils.h
View File

@@ -105,10 +105,10 @@ void VP8LHtreeGroupsFree(HTreeGroup* const htree_groups);
// the huffman table.
// Returns built table size or 0 in case of error (invalid tree or
// memory error).
WEBP_NODISCARD int VP8LBuildHuffmanTable(HuffmanTables* const root_table,
int root_bits,
const int code_lengths[],
int code_lengths_size);
WEBP_NODISCARD int VP8LBuildHuffmanTable(
HuffmanTables* const root_table, int root_bits,
const int WEBP_COUNTED_BY(code_lengths_size) code_lengths[],
int code_lengths_size);
#ifdef __cplusplus
} // extern "C"