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Fix #19442 - Fix heap underflow in pyc marshalling ##crash

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This commit is contained in:
pancake 2021-11-28 00:39:01 +01:00
parent a0fd446a7b
commit 0505cac914
1 changed files with 10 additions and 3 deletions
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13
libr/bin/format/pyc/marshal.c
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@ -212,6 +212,9 @@ static pyc_object *get_long_object(RBuffer *buffer) {
left += 15;
while (left >= 4) {
if (j < 0) {
break;
}
hexstr[--j] = digist2hex[tmp & 0xf];
tmp >>= 4;
left -= 4;
@ -222,9 +225,13 @@ static pyc_object *get_long_object(RBuffer *buffer) {
hexstr[--j] = digist2hex[tmp & 0xf];
}
hexstr[--j] = 'x';
hexstr[--j] = '0';
if (neg) {
if (j > 0) {
hexstr[--j] = 'x';
}
if (j > 0) {
hexstr[--j] = '0';
}
if (neg && j > 0) {
hexstr[--j] = '-';
}