kopia lustrzana https://gitlab.com/sane-project/backends
Merge branch 'issue05-out-of-bounds-read-decode_binary' into '279-confidential-issue'
epsonds: Do not read beyond the end of the token See merge request paddy-hack/backends!5merge-requests/463/merge
commit
3d005c2570
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@ -257,18 +257,20 @@ static int decode_value(char *buf, int len)
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}
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/* h000 */
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static char *decode_binary(char *buf)
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static char *decode_binary(char *buf, int len)
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{
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char tmp[6];
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int hl;
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memcpy(tmp, buf, 4);
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tmp[4] = '\0';
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len -= 4;
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if (buf[0] != 'h')
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return NULL;
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hl = strtol(tmp + 1, NULL, 16);
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if (hl > len) hl = len;
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if (hl) {
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char *v = malloc(hl + 1);
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@ -281,9 +283,9 @@ static char *decode_binary(char *buf)
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return NULL;
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}
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static char *decode_string(char *buf)
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static char *decode_string(char *buf, int len)
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{
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char *p, *s = decode_binary(buf);
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char *p, *s = decode_binary(buf, len);
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if (s == NULL)
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return NULL;
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@ -328,20 +330,20 @@ static SANE_Status info_cb(void *userdata, char *token, int len)
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if (strncmp("PRD", token, 3) == 0) {
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free(s->hw->model);
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s->hw->model = decode_string(value);
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s->hw->model = decode_string(value, len);
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s->hw->sane.model = s->hw->model;
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DBG(1, " product: %s\n", s->hw->model);
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/* we will free the string later */
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}
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if (strncmp("VER", token, 3) == 0) {
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char *v = decode_string(value);
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char *v = decode_string(value, len);
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DBG(1, " version: %s\n", v);
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free(v);
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}
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if (strncmp("S/N", token, 3) == 0) {
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char *v = decode_string(value);
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char *v = decode_string(value, len);
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DBG(1, " serial: %s\n", v);
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free(v);
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}
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