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bnxt_en: Fix memory fault in bnxt_ethtool_init() 

In some firmware images, the length of BNX_DIR_TYPE_PKG_LOG nvram type
could be greater than the fixed buffer length of 4096 bytes allocated by
the driver.  This was causing HWRM_NVM_READ to copy more data to the buffer
than the allocated size, causing general protection fault.

Fix the issue by allocating the exact buffer length returned by
HWRM_NVM_FIND_DIR_ENTRY, instead of 4096.  Move the kzalloc() call
into the bnxt_get_pkgver() function.

Fixes: 3ebf6f0a09 ("bnxt_en: Add installed-package firmware version reporting via Ethtool GDRVINFO")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasundhara Volam 2018-04-19 03:16:16 -04:00 committed by David S. Miller
parent 0df8bb01cb
commit a60faa60da
2 changed files with 27 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
View File

@ -1927,22 +1927,39 @@ static char *bnxt_parse_pkglog(int desired_field, u8 *data, size_t datalen)
return retval;
}
static char *bnxt_get_pkgver(struct net_device *dev, char *buf, size_t buflen)
static void bnxt_get_pkgver(struct net_device *dev)
{
struct bnxt *bp = netdev_priv(dev);
u16 index = 0;
u32 datalen;
char *pkgver;
u32 pkglen;
u8 *pkgbuf;
int len;
if (bnxt_find_nvram_item(dev, BNX_DIR_TYPE_PKG_LOG,
BNX_DIR_ORDINAL_FIRST, BNX_DIR_EXT_NONE,
&index, NULL, &datalen) != 0)
return NULL;
&index, NULL, &pkglen) != 0)
return;
memset(buf, 0, buflen);
if (bnxt_get_nvram_item(dev, index, 0, datalen, buf) != 0)
return NULL;
pkgbuf = kzalloc(pkglen, GFP_KERNEL);
if (!pkgbuf) {
dev_err(&bp->pdev->dev, "Unable to allocate memory for pkg version, length = %u\n",
pkglen);
return;
}
return bnxt_parse_pkglog(BNX_PKG_LOG_FIELD_IDX_PKG_VERSION, buf,
datalen);
if (bnxt_get_nvram_item(dev, index, 0, pkglen, pkgbuf))
goto err;
pkgver = bnxt_parse_pkglog(BNX_PKG_LOG_FIELD_IDX_PKG_VERSION, pkgbuf,
pkglen);
if (pkgver && *pkgver != 0 && isdigit(*pkgver)) {
len = strlen(bp->fw_ver_str);
snprintf(bp->fw_ver_str + len, FW_VER_STR_LEN - len - 1,
"/pkg %s", pkgver);
}
err:
kfree(pkgbuf);
}
static int bnxt_get_eeprom(struct net_device *dev,
@ -2615,22 +2632,10 @@ void bnxt_ethtool_init(struct bnxt *bp)
struct hwrm_selftest_qlist_input req = {0};
struct bnxt_test_info *test_info;
struct net_device *dev = bp->dev;
char *pkglog;
int i, rc;
pkglog = kzalloc(BNX_PKG_LOG_MAX_LENGTH, GFP_KERNEL);
if (pkglog) {
char *pkgver;
int len;
bnxt_get_pkgver(dev);
pkgver = bnxt_get_pkgver(dev, pkglog, BNX_PKG_LOG_MAX_LENGTH);
if (pkgver && *pkgver != 0 && isdigit(*pkgver)) {
len = strlen(bp->fw_ver_str);
snprintf(bp->fw_ver_str + len, FW_VER_STR_LEN - len - 1,
"/pkg %s", pkgver);
}
kfree(pkglog);
}
if (bp->hwrm_spec_code < 0x10704 || !BNXT_SINGLE_PF(bp))
return;

2
drivers/net/ethernet/broadcom/bnxt/bnxt_nvm_defs.h
View File

@ -59,8 +59,6 @@ enum bnxt_nvm_directory_type {
#define BNX_DIR_ATTR_NO_CHKSUM (1 << 0)
#define BNX_DIR_ATTR_PROP_STREAM (1 << 1)
#define BNX_PKG_LOG_MAX_LENGTH 4096
enum bnxnvm_pkglog_field_index {
BNX_PKG_LOG_FIELD_IDX_INSTALLED_TIMESTAMP = 0,
BNX_PKG_LOG_FIELD_IDX_PKG_DESCRIPTION = 1,