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drivers/char/ipmi: memcpy, need additional 2 bytes to avoid memory overflow 

When calling memcpy, read_data and write_data need additional 2 bytes.

  write_data:
    for checking:  "if (size > IPMI_MAX_MSG_LENGTH)"
    for operating: "memcpy(bt->write_data + 3, data + 1, size - 1)"

  read_data:
    for checking:  "if (msg_len < 3 || msg_len > IPMI_MAX_MSG_LENGTH)"
    for operating: "memcpy(data + 2, bt->read_data + 4, msg_len - 2)"

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chen Gang 2013-05-16 14:04:25 -05:00 committed by Linus Torvalds
parent 1b6b698f53
commit a5f2b3d6a7
1 changed files with 2 additions and 2 deletions
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4
drivers/char/ipmi/ipmi_bt_sm.c
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@ -95,9 +95,9 @@ struct si_sm_data {
enum bt_states state;
unsigned char seq; /* BT sequence number */
struct si_sm_io *io;
unsigned char write_data[IPMI_MAX_MSG_LENGTH];
unsigned char write_data[IPMI_MAX_MSG_LENGTH + 2]; /* +2 for memcpy */
int write_count;
unsigned char read_data[IPMI_MAX_MSG_LENGTH];
unsigned char read_data[IPMI_MAX_MSG_LENGTH + 2]; /* +2 for memcpy */
int read_count;
int truncated;
long timeout; /* microseconds countdown */