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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 <jgarber1@ualberta.ca>
Change-Id: I6826d79338b26ff9696ab6ac9eb4c59f734687d8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32778
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Jacob Garber 2019-05-13 17:04:00 -06:00 committed by Patrick Georgi
parent 807803afa2
commit 724c66c88f
1 changed files with 6 additions and 3 deletions
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9
payloads/libpayload/drivers/storage/ahci.c
View File

@ -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;