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FIXME: will crash if sample buffer does not contain valid legic data (fixed by Sourcerer)

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This commit is contained in:
adam@algroup.co.uk 2010-02-05 20:08:02 +00:00
parent 41dab15305
commit 313322658c
1 changed files with 3 additions and 4 deletions
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7
client/cmdhflegic.c
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@ -33,7 +33,6 @@ int CmdHelp(const char *Cmd)
* Output BigBuf and deobfuscate LEGIC RF tag data. * Output BigBuf and deobfuscate LEGIC RF tag data.
* This is based on information given in the talk held * This is based on information given in the talk held
* by Henryk Ploetz and Karsten Nohl at 26c3 * by Henryk Ploetz and Karsten Nohl at 26c3
* FIXME: will crash if sample buffer does not contain valid legic data
*/ */
int CmdLegicDecode(const char *Cmd) int CmdLegicDecode(const char *Cmd)
{ {
@ -162,7 +161,7 @@ int CmdLegicDecode(const char *Cmd)
if (wrc>0) { if (wrc>0) {
PrintAndLog("WRC protected area:"); PrintAndLog("WRC protected area:");
for (k=0, j=0; k < wrc; k++, i++, j += 3) { for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
out_string[j+2] = ' '; out_string[j+2] = ' ';
}; };
@ -175,7 +174,7 @@ int CmdLegicDecode(const char *Cmd)
if (wrp>wrc) { if (wrp>wrc) {
PrintAndLog("Remaining write protected area:"); PrintAndLog("Remaining write protected area:");
for (k=0, j=0; k < (wrp-wrc); k++, i++, j += 3) { for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
out_string[j+2] = ' '; out_string[j+2] = ' ';
}; };
@ -190,7 +189,7 @@ int CmdLegicDecode(const char *Cmd)
} }
PrintAndLog("Remaining segment payload:"); PrintAndLog("Remaining segment payload:");
for (k=0, j=0; k < (segment_len - wrp - 5); k++, i++, j += 3) { for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
out_string[j+2] = ' '; out_string[j+2] = ' ';
}; };