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| author | Jean Delvare <jdelvare@suse.de> | 2019-10-14 21:41:24 +0200 |
|---|---|---|
| committer | Jean Delvare <jdelvare@suse.de> | 2019-10-14 21:41:24 +0200 |
| commit | 81dde26de9c08bb04c4962a15608778aaffb3cf9 (patch) | |
| tree | bc604f0869cd029884a34fca379c5a70da2ab1c8 | |
| parent | Linux 5.3 (diff) | |
| download | linux-81dde26de9c08bb04c4962a15608778aaffb3cf9.tar.xz linux-81dde26de9c08bb04c4962a15608778aaffb3cf9.zip | |
firmware: dmi: Fix unlikely out-of-bounds read in save_mem_devices
Before reading the Extended Size field, we should ensure it fits in
the DMI record. There is already a record length check but it does
not cover that field.
It would take a seriously corrupted DMI table to hit that bug, so no
need to worry, but we should still fix it.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: 6deae96b42eb ("firmware, DMI: Add function to look up a handle and return DIMM size")
Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@suse.de>
| -rw-r--r-- | drivers/firmware/dmi_scan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index 35ed56b9c34f..1e21fc3e9851 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -408,7 +408,7 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v) bytes = ~0ull; else if (size & 0x8000) bytes = (u64)(size & 0x7fff) << 10; - else if (size != 0x7fff) + else if (size != 0x7fff || dm->length < 0x20) bytes = (u64)size << 20; else bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20; |