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| author | Jan Dabros <jsd@semihalf.com> | 2020-08-19 15:06:10 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-08-26 07:32:45 +0000 |
| commit | fc83588e85c5ec080db368f30521e27f1535f34c (patch) | |
| tree | 47f16c172a797b82726e69ebd8a11c04a2d0b840 /src | |
| parent | 28d4c2e9075ecc053cad32f6f8fdc706a30ccf26 (diff) | |
| download | coreboot-fc83588e85c5ec080db368f30521e27f1535f34c.tar.xz | |
lib/imd: Add an extra check for root_size
Add a check that root_size provided by the caller accounts for one
imd_entry necessary for covering imd_root region. Without this, we
may end up with writing on unallocated memory.
Signed-off-by: Jan Dabros <jsd@semihalf.com>
Change-Id: I0a39d56f7a2a6fa026d259c5b5b78def4f115095
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44665
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/lib/imd.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/lib/imd.c b/src/lib/imd.c index 3be38ea678..2b028a7b44 100644 --- a/src/lib/imd.c +++ b/src/lib/imd.c @@ -144,10 +144,11 @@ static int imdr_create_empty(struct imdr *imdr, size_t root_size, /* * root_size needs to be large enough to accommodate root pointer and - * root book keeping structure. The caller needs to ensure there's - * enough room for tracking individual allocations. + * root book keeping structure. Furthermore, there needs to be a space + * for at least one entry covering root region. The caller needs to + * ensure there's enough room for tracking individual allocations. */ - if (root_size < (sizeof(*rp) + sizeof(*r))) + if (root_size < (sizeof(*rp) + sizeof(*r) + sizeof(*e))) return -1; /* For simplicity don't allow sizes or alignments to exceed LIMIT_ALIGN. |