File Check-for-overflow-when-calculating-on-disk-attribute-data-size-2459.patch of Package hdf5.28370
From: Egbert Eich <eich@suse.com>
Date: Sat Feb 11 13:54:17 2023 +0100
Subject: Check for overflow when calculating on-disk attribute data size (#2459)
Patch-mainline: Not yet
Git-repo: https://github.com/HDFGroup/hdf5
Git-commit: 0d026daa13a81be72495872f651c036fdc84ae5e
References:
A bogus hdf5 file may contain dataspace messages with sizes
which lead to the on-disk data sizes to exceed what is addressable.
When calculating the size, make sure, the multiplication does not
overflow.
The test case was crafted in a way that the overflow caused the
size to be 0.
This fixes CVE-2021-37501 / Bug #2458.
Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
src/H5Oattr.c | 3 +++
src/H5private.h | 18 ++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/src/H5Oattr.c b/src/H5Oattr.c
index 4dee7aa187..3ef0b99aa4 100644
--- a/src/H5Oattr.c
+++ b/src/H5Oattr.c
@@ -235,6 +235,9 @@ H5O_attr_decode(H5F_t *f, H5O_t *open_oh, unsigned H5_ATTR_UNUSED mesg_flags, un
/* Compute the size of the data */
H5_CHECKED_ASSIGN(attr->shared->data_size, size_t, ds_size * (hsize_t)dt_size, hsize_t);
+ H5_CHECK_MUL_OVERFLOW(attr->shared->data_size, ds_size, dt_size,
+ HGOTO_ERROR(H5E_RESOURCE, H5E_OVERFLOW, NULL,
+ "data size exceeds addressable range"))
/* Go get the data */
if (attr->shared->data_size) {
diff --git a/src/H5private.h b/src/H5private.h
index 931d7b9046..a115aee1a4 100644
--- a/src/H5private.h
+++ b/src/H5private.h
@@ -1605,6 +1605,24 @@ H5_DLL int HDvasprintf(char **bufp, const char *fmt, va_list _ap);
#define H5_CHECK_OVERFLOW(var, vartype, casttype)
#endif /* NDEBUG */
+/*
+ * A macro for checking whether a multiplication has overflown
+ * r is assumed to be the result of a prior multiplication of a and b
+ */
+#define H5_CHECK_MUL_OVERFLOW(r, a, b, err) \
+ { \
+ bool mul_overflow = false; \
+ if (r != 0) { \
+ if (r / a != b) \
+ mul_overflow = true; \
+ } else { \
+ if (a != 0 && b != 0) \
+ mul_overflow = true; \
+ } \
+ if (mul_overflow) \
+ err \
+ }
+
/*
* A macro for detecting over/under-flow when assigning between types
*/
