From 724c66c88fa219087f4d6a0ccce1ba1d6f93c93b Mon Sep 17 00:00:00 2001 From: Jacob Garber Date: Mon, 13 May 2019 17:04:00 -0600 Subject: libpayload: ahci: Prevent memory leaks when failing on init Free several resources when AHCI initialization fails. Note that it is only safe to free resources when the command engine has stopped, since otherwise they may still be used for DMA. Found-by: Coverity CID 1260719, 1260727, 1261090, 1261098 Signed-off-by: Jacob Garber Change-Id: I6826d79338b26ff9696ab6ac9eb4c59f734687d8 Reviewed-on: https://review.coreboot.org/c/coreboot/+/32778 Tested-by: build bot (Jenkins) Reviewed-by: HAOUAS Elyes Reviewed-by: Nico Huber --- payloads/libpayload/drivers/storage/ahci.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/payloads/libpayload/drivers/storage/ahci.c b/payloads/libpayload/drivers/storage/ahci.c index 40e1008cf4..f74adafd75 100644 --- a/payloads/libpayload/drivers/storage/ahci.c +++ b/payloads/libpayload/drivers/storage/ahci.c @@ -108,6 +108,9 @@ static int ahci_dev_init(hba_ctrl_t *const ctrl, const int ncs = HBA_CAPS_DECODE_NCS(ctrl->caps); + if (ahci_cmdengine_stop(port)) + return 1; + /* Allocate command list, one command table and received FIS. */ cmd_t *const cmdlist = memalign(1024, ncs * sizeof(cmd_t)); cmdtable_t *const cmdtable = memalign(128, sizeof(cmdtable_t)); @@ -121,12 +124,10 @@ static int ahci_dev_init(hba_ctrl_t *const ctrl, memset((void *)rcvd_fis, '\0', sizeof(*rcvd_fis)); /* Set command list base and received FIS base. */ - if (ahci_cmdengine_stop(port)) - return 1; port->cmdlist_base = virt_to_phys(cmdlist); port->frameinfo_base = virt_to_phys(rcvd_fis); if (ahci_cmdengine_start(port)) - return 1; + goto _cleanup_ret; /* Put port into active state. */ port->cmd_stat |= HBA_PxCMD_ICC_ACTIVE; @@ -178,6 +179,8 @@ _cleanup_ret: /* Clean up (not reached for initialized devices). */ if (dev) free(dev); + /* Only free if stopping succeeds, since otherwise the controller may + still use the resources for DMA. */ if (!ahci_cmdengine_stop(port)) { port->cmdlist_base = 0; port->frameinfo_base = 0; -- cgit v1.2.3