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net/sfc/base: resolve code analysis warnings

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Minimal changes adding buffer size checks and simplifying checksum
processing.

Signed-off-by: Richard Houldsworth <rhouldsworth@solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Richard Houldsworth 2018-02-20 07:34:01 +00:00 committed by Ferruh Yigit
parent 400ba3daee
commit 667d40513f
1 changed files with 48 additions and 19 deletions
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67
drivers/net/sfc/base/efx_bootcfg.c
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@ -209,19 +209,25 @@ efx_bootcfg_copy_sector(
size_t used_bytes;
efx_rc_t rc;
/* Minimum buffer is checksum byte and DHCP_END terminator */
if (data_size < 2) {
rc = ENOSPC;
goto fail1;
}
/* Verify that the area is correctly formatted and checksummed */
rc = efx_bootcfg_verify(enp, sector, sector_length,
&used_bytes);
if (!handle_format_errors) {
if (rc != 0)
goto fail1;
goto fail2;
if ((used_bytes < 2) ||
(sector[used_bytes - 1] != DHCP_END)) {
/* Block too short, or DHCP_END missing */
rc = ENOENT;
goto fail2;
goto fail3;
}
}
@ -255,9 +261,13 @@ efx_bootcfg_copy_sector(
*/
if (used_bytes > data_size) {
rc = ENOSPC;
goto fail3;
goto fail4;
}
memcpy(data, sector, used_bytes);
data[0] = 0; /* checksum, updated below */
/* Copy all after the checksum to the target buffer */
memcpy(data + 1, sector + 1, used_bytes - 1);
/* Zero out the unused portion of the target buffer */
if (used_bytes < data_size)
@ -271,6 +281,8 @@ efx_bootcfg_copy_sector(
return (0);
fail4:
EFSYS_PROBE(fail4);
fail3:
EFSYS_PROBE(fail3);
fail2:
@ -295,6 +307,12 @@ efx_bootcfg_read(
efx_rc_t rc;
uint32_t sector_number;
/* Minimum buffer is checksum byte and DHCP_END terminator */
if (size < 2) {
rc = ENOSPC;
goto fail1;
}
#if EFSYS_OPT_HUNTINGTON || EFSYS_OPT_MEDFORD || EFSYS_OPT_MEDFORD2
sector_number = enp->en_nic_cfg.enc_pf;
#else
@ -302,13 +320,18 @@ efx_bootcfg_read(
#endif
rc = efx_nvram_size(enp, EFX_NVRAM_BOOTROM_CFG, &partn_length);
if (rc != 0)
goto fail1;
goto fail2;
/* The bootcfg sector may be stored in a (larger) shared partition */
rc = efx_bootcfg_sector_info(enp, sector_number,
NULL, &sector_offset, &sector_length);
if (rc != 0)
goto fail2;
goto fail3;
if (sector_length < 2) {
rc = EINVAL;
goto fail4;
}
if (sector_length > BOOTCFG_MAX_SIZE)
sector_length = BOOTCFG_MAX_SIZE;
@ -316,7 +339,7 @@ efx_bootcfg_read(
if (sector_offset + sector_length > partn_length) {
/* Partition is too small */
rc = EFBIG;
goto fail3;
goto fail5;
}
/*
@ -329,28 +352,28 @@ efx_bootcfg_read(
EFSYS_KMEM_ALLOC(enp->en_esip, sector_length, payload);
if (payload == NULL) {
rc = ENOMEM;
goto fail4;
goto fail6;
}
} else
payload = (uint8_t *)data;
if ((rc = efx_nvram_rw_start(enp, EFX_NVRAM_BOOTROM_CFG, NULL)) != 0)
goto fail5;
goto fail7;
if ((rc = efx_nvram_read_chunk(enp, EFX_NVRAM_BOOTROM_CFG,
sector_offset, (caddr_t)payload, sector_length)) != 0) {
(void) efx_nvram_rw_finish(enp, EFX_NVRAM_BOOTROM_CFG, NULL);
goto fail6;
goto fail8;
}
if ((rc = efx_nvram_rw_finish(enp, EFX_NVRAM_BOOTROM_CFG, NULL)) != 0)
goto fail7;
goto fail9;
/* Verify that the area is correctly formatted and checksummed */
rc = efx_bootcfg_verify(enp, payload, sector_length,
&used_bytes);
if (rc != 0 || used_bytes == 0) {
payload[0] = (uint8_t)(~DHCP_END & 0xff);
payload[0] = 0;
payload[1] = DHCP_END;
used_bytes = 2;
}
@ -365,10 +388,8 @@ efx_bootcfg_read(
* so reinitialise the sector if there isn't room for the character.
*/
if (payload[used_bytes - 1] != DHCP_END) {
if (used_bytes + 1 > sector_length) {
payload[0] = 0;
if (used_bytes >= sector_length)
used_bytes = 1;
}
payload[used_bytes] = DHCP_END;
++used_bytes;
@ -380,10 +401,14 @@ efx_bootcfg_read(
*/
if (used_bytes > size) {
rc = ENOSPC;
goto fail8;
goto fail10;
}
data[0] = 0; /* checksum, updated below */
if (sector_length > size) {
memcpy(data, payload, used_bytes);
/* Copy all after the checksum to the target buffer */
memcpy(data + 1, payload + 1, used_bytes - 1);
EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload);
}
@ -399,16 +424,20 @@ efx_bootcfg_read(
return (0);
fail10:
EFSYS_PROBE(fail10);
fail9:
EFSYS_PROBE(fail9);
fail8:
EFSYS_PROBE(fail8);
fail7:
EFSYS_PROBE(fail7);
if (sector_length > size)
EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload);
fail6:
EFSYS_PROBE(fail6);
fail5:
EFSYS_PROBE(fail5);
if (sector_length > size)
EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload);
fail4:
EFSYS_PROBE(fail4);
fail3: