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Fix bounds on update ef.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2026-03-18 17:42:25 +01:00
parent 3af776ec26
commit 1f96fe619b
1 changed files with 3 additions and 3 deletions
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6
src/hsm/cmd_update_ef.c
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@@ -84,12 +84,12 @@ int cmd_update_ef(void) {
if (!file_has_data(ef)) {
return SW_DATA_INVALID();
}
if (offset + data_len > file_get_size(ef)) {
if (offset + data_len > 4032) {
return SW_WRONG_LENGTH();
}
uint8_t *data_merge = (uint8_t *) calloc(1, offset + data_len);
memcpy(data_merge, file_get_data(ef), offset);
uint8_t *data_merge = (uint8_t *) calloc(1, MAX(offset + data_len, file_get_size(ef)));
memcpy(data_merge, file_get_data(ef), file_get_size(ef));
memcpy(data_merge + offset, data, data_len);
int r = file_put_data(ef, data_merge, offset + data_len);
free(data_merge);