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Fix Heap-buffer-overflow in __parse_options #1678

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Fix Heap-buffer-overflow in __parse_options #1678

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8d546b1
Fix vuln crash-7d18f37e1f05e0ff4aa4dfa2f67dd738340ad9cf
aled-ua Dec 24, 2024
e347d4d
Move the heap overflow check before the allocation
aled-ua Jan 4, 2025
6c67fb2
Terminating immediately when overflow is found
aled-ua Jan 9, 2025
6c5d27f
Fix typo err
aled-ua Jan 9, 2025
bcdb1a2
Merge branch 'dev' into patch-crash-7d18f37e1f05e0ff4aa4dfa2f67dd7383…
cla7aye15I4nd Jan 21, 2025
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13 changes: 12 additions & 1 deletion 3rdParty/LightPcapNg/LightPcapNg/src/light_pcapng.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,13 +49,24 @@ static struct _light_option *__parse_options(uint32_t **memory, const int32_t ma
opt->custom_option_code = *local_memory++;
opt->option_length = *local_memory++;

// Validate option_length
if (opt->option_length > max_len - 2 * sizeof(*local_memory)) {
free(opt);
return NULL;
}

actual_length = (opt->option_length % alignment) == 0 ?
opt->option_length :
(opt->option_length / alignment + 1) * alignment;

if (actual_length > 0) {
opt->data = calloc(1, actual_length);
memcpy(opt->data, local_memory, actual_length);
if (actual_length <= max_len - 2 * sizeof(*local_memory)) {
memcpy(opt->data, local_memory, actual_length);
} else {
free(opt->data);
opt->data = NULL;
}
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local_memory += (sizeof(**memory) / sizeof(*local_memory)) * (actual_length / alignment);
}

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