AuroraMiddleware/zstd
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cli: control numeric argument overflow

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exit on overflow
backported from paramgrill
added associated test case
This commit is contained in:
Yann Collet 2018-05-12 14:29:33 -07:00
parent 66b81817b5
commit 9cd5c63771
2 changed files with 20 additions and 4 deletions
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22
programs/zstdcli.c
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@ -219,20 +219,34 @@ static int exeNameMatch(const char* exeName, const char* test)
(exeName[strlen(test)] == '\0' || exeName[strlen(test)] == '.');
}
static void errorOut(const char* msg)
{
DISPLAY("%s \n", msg); exit(1);
}
/*! readU32FromChar() :
* @return : unsigned integer value read from input in `char` format.
* allows and interprets K, KB, KiB, M, MB and MiB suffix.
* Will also modify `*stringPtr`, advancing it to position where it stopped reading.
* Note : function result can overflow if digit string > MAX_UINT */
* Note : function will exit() program if digit sequence overflows */
static unsigned readU32FromChar(const char** stringPtr)
{
const char errorMsg[] = "error: numeric value too large";
unsigned result = 0;
while ((**stringPtr >='0') && (**stringPtr <='9'))
while ((**stringPtr >='0') && (**stringPtr <='9')) {
unsigned const max = (((unsigned)(-1)) / 10) - 1;
if (result > max) errorOut(errorMsg);
result *= 10, result += **stringPtr - '0', (*stringPtr)++ ;
}
if ((**stringPtr=='K') || (**stringPtr=='M')) {
unsigned const maxK = ((unsigned)(-1)) >> 10;
if (result > maxK) errorOut(errorMsg);
result <<= 10;
if (**stringPtr=='M') result <<= 10;
(*stringPtr)++ ;
if (**stringPtr=='M') {
if (result > maxK) errorOut(errorMsg);
result <<= 10;
}
(*stringPtr)++; /* skip `K` or `M` */
if (**stringPtr=='i') (*stringPtr)++;
if (**stringPtr=='B') (*stringPtr)++;
}

2
tests/playTests.sh
View File

@ -108,6 +108,8 @@ $ECHO "test : --fast aka negative compression levels"
$ZSTD --fast -f tmp # == -1
$ZSTD --fast=3 -f tmp # == -3
$ZSTD --fast=200000 -f tmp # == no compression
$ECHO "test : too large numeric argument"
$ZSTD --fast=9999999999 -f tmp && die "should have refused numeric value"
$ECHO "test : compress to stdout"
$ZSTD tmp -c > tmpCompressed
$ZSTD tmp --stdout > tmpCompressed # long command format