62 lines
2.1 KiB
Diff
62 lines
2.1 KiB
Diff
This is a security patch addressing the Venom security issue (CVE-2015-3456)
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Patch pulled from qemu's git repository:
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http://git.qemu.org/?p=qemu.git;a=commitdiff;h=e907746266721f305d67bc0718795fedee2e824c
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--- hw/block/fdc.c
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+++ hw/block/fdc.c
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@@ -1497,7 +1497,7 @@ static uint32_t fdctrl_read_data(FDCtrl *fdctrl)
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{
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FDrive *cur_drv;
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uint32_t retval = 0;
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- int pos;
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+ uint32_t pos;
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cur_drv = get_cur_drv(fdctrl);
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fdctrl->dsr &= ~FD_DSR_PWRDOWN;
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@@ -1506,8 +1506,8 @@ static uint32_t fdctrl_read_data(FDCtrl *fdctrl)
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return 0;
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}
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pos = fdctrl->data_pos;
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+ pos %= FD_SECTOR_LEN;
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if (fdctrl->msr & FD_MSR_NONDMA) {
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- pos %= FD_SECTOR_LEN;
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if (pos == 0) {
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if (fdctrl->data_pos != 0)
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if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
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@@ -1852,10 +1852,13 @@ static void fdctrl_handle_option(FDCtrl *fdctrl, int direction)
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static void fdctrl_handle_drive_specification_command(FDCtrl *fdctrl, int direction)
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{
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FDrive *cur_drv = get_cur_drv(fdctrl);
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+ uint32_t pos;
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- if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x80) {
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+ pos = fdctrl->data_pos - 1;
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+ pos %= FD_SECTOR_LEN;
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+ if (fdctrl->fifo[pos] & 0x80) {
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/* Command parameters done */
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- if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x40) {
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+ if (fdctrl->fifo[pos] & 0x40) {
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fdctrl->fifo[0] = fdctrl->fifo[1];
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fdctrl->fifo[2] = 0;
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fdctrl->fifo[3] = 0;
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@@ -1955,7 +1958,7 @@ static uint8_t command_to_handler[256];
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static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value)
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{
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FDrive *cur_drv;
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- int pos;
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+ uint32_t pos;
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/* Reset mode */
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if (!(fdctrl->dor & FD_DOR_nRESET)) {
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@@ -2004,7 +2007,9 @@ static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value)
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}
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FLOPPY_DPRINTF("%s: %02x\n", __func__, value);
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- fdctrl->fifo[fdctrl->data_pos++] = value;
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+ pos = fdctrl->data_pos++;
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+ pos %= FD_SECTOR_LEN;
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+ fdctrl->fifo[pos] = value;
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if (fdctrl->data_pos == fdctrl->data_len) {
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/* We now have all parameters
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* and will be able to treat the command
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