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mdbx: fix unaligned access to mp_ptrs[] on fake-page.

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Based on http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commitdiff;h=e77918a903d980ff789b7e32f71725481e870510
This commit is contained in:
Leo Yuriev
2018-03-22 21:10:14 +03:00
parent dbc87a8a5e
commit 6a074cb85a
1 changed files with 4 additions and 2 deletions
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6
src/mdbx.c
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@@ -7406,9 +7406,11 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
memcpy((char *)mp + mp->mp_upper + PAGEHDRSZ, memcpy((char *)mp + mp->mp_upper + PAGEHDRSZ,
(char *)fp + fp->mp_upper + PAGEHDRSZ, (char *)fp + fp->mp_upper + PAGEHDRSZ,
olddata.iov_len - fp->mp_upper - PAGEHDRSZ); olddata.iov_len - fp->mp_upper - PAGEHDRSZ);
memcpy((char *)(&mp->mp_ptrs), (char *)(&fp->mp_ptrs),
NUMKEYS(fp) * sizeof(mp->mp_ptrs[0]));
for (i = 0; i < NUMKEYS(fp); i++) { for (i = 0; i < NUMKEYS(fp); i++) {
mdbx_cassert(mc, fp->mp_ptrs[i] + offset <= UINT16_MAX); mdbx_cassert(mc, mp->mp_ptrs[i] + offset <= UINT16_MAX);
mp->mp_ptrs[i] = (indx_t)(fp->mp_ptrs[i] + offset); mp->mp_ptrs[i] += (indx_t)offset;
} }
} }
} }