diff options
| author | Atul Gopinathan <atulgopinathan@gmail.com> | 2021-03-23 17:04:12 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-07 12:04:22 +0200 |
| commit | 1b404b9a2a5c8594f97eb357e157195a10c4620b (patch) | |
| tree | f80022d3424342d6ad86f257599106faa9dadcec | |
| parent | 1f39a43e67cff4b84b8549133f696f7ba475b1d7 (diff) | |
staging: rtl8192e: Fix incorrect source in memcpy()
commit 72ad25fbbb78930f892b191637359ab5b94b3190 upstream.
The variable "info_element" is of the following type:
struct rtllib_info_element *info_element
defined in drivers/staging/rtl8192e/rtllib.h:
struct rtllib_info_element {
u8 id;
u8 len;
u8 data[];
} __packed;
The "len" field defines the size of the "data[]" array. The code is
supposed to check if "info_element->len" is greater than 4 and later
equal to 6. If this is satisfied then, the last two bytes (the 4th and
5th element of u8 "data[]" array) are copied into "network->CcxRmState".
Right now the code uses "memcpy()" with the source as "&info_element[4]"
which would copy in wrong and unintended information. The struct
"rtllib_info_element" has a size of 2 bytes for "id" and "len",
therefore indexing will be done in interval of 2 bytes. So,
"info_element[4]" would point to data which is beyond the memory
allocated for this pointer (that is, at x+8, while "info_element" has
been allocated only from x to x+7 (2 + 6 => 8 bytes)).
This patch rectifies this error by using "&info_element->data[4]" which
correctly copies the last two bytes of "data[]".
NOTE: The faulty line of code came from the following commit:
commit ecdfa44610fa ("Staging: add Realtek 8192 PCI wireless driver")
The above commit created the file `rtl8192e/ieee80211/ieee80211_rx.c`
which had the faulty line of code. This file has been deleted (or
possibly renamed) with the contents copied in to a new file
`rtl8192e/rtllib_rx.c` along with additional code in the commit
94a799425eee (tagged in Fixes).
Fixes: 94a799425eee ("From: wlanfae <wlanfae@realtek.com> [PATCH 1/8] rtl8192e: Import new version of driver from realtek")
Cc: stable@vger.kernel.org
Signed-off-by: Atul Gopinathan <atulgopinathan@gmail.com>
Link: https://lore.kernel.org/r/20210323113413.29179-1-atulgopinathan@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/rtl8192e/rtllib_rx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c index 37343ec3b484..6921e036a828 100644 --- a/drivers/staging/rtl8192e/rtllib_rx.c +++ b/drivers/staging/rtl8192e/rtllib_rx.c @@ -1988,7 +1988,7 @@ static void rtllib_parse_mife_generic(struct rtllib_device *ieee, info_element->data[2] == 0x96 && info_element->data[3] == 0x01) { if (info_element->len == 6) { - memcpy(network->CcxRmState, &info_element[4], 2); + memcpy(network->CcxRmState, &info_element->data[4], 2); if (network->CcxRmState[0] != 0) network->bCcxRmEnable = true; else |