Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-10-31 09:11:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

mei: validate the message header only in first fragment.

Browse Source 
RX message header is received in the first fragment of
the message and saved side and it is not modified after that,
we don't need to validate it upon each fragment.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2017-06-12 12:15:55 +03:00 committed by Greg Kroah-Hartman
parent f85e8813b2
commit 99c06866bc
1 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/misc/mei/interrupt.c
View File

@ -235,6 +235,17 @@ static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0;
}
static inline int hdr_is_valid(u32 msg_hdr)
{
struct mei_msg_hdr *mei_hdr;
mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
if (!msg_hdr || mei_hdr->reserved)
return -EBADMSG;
return 0;
}
/**
* mei_irq_read_handler - bottom half read routine after ISR to
* handle the read processing.
@ -256,17 +267,18 @@ int mei_irq_read_handler(struct mei_device *dev,
dev->rd_msg_hdr = mei_read_hdr(dev);
(*slots)--;
dev_dbg(dev->dev, "slots =%08x.\n", *slots);
}
mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
if (mei_hdr->reserved || !dev->rd_msg_hdr) {
dev_err(dev->dev, "corrupted message header 0x%08X\n",
ret = hdr_is_valid(dev->rd_msg_hdr);
if (ret) {
dev_err(dev->dev, "corrupted message header 0x%08X\n",
dev->rd_msg_hdr);
ret = -EBADMSG;
goto end;
goto end;
}
}
mei_hdr = (struct mei_msg_hdr *)&dev->rd_msg_hdr;
dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
if (mei_slots2data(*slots) < mei_hdr->length) {
dev_err(dev->dev, "less data available than length=%08x.\n",
*slots);