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mdbx: check size of lck-file.

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This commit is contained in:
Leo Yuriev 2017-05-25 09:20:04 +03:00
parent c335b16c81
commit 15e2a45425
1 changed files with 13 additions and 1 deletions
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14
src/mdbx.c
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@ -3828,7 +3828,19 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname, int mode) {
size = wanna; size = wanna;
} }
} }
env->me_maxreaders = (size - sizeof(MDBX_lockinfo)) / sizeof(MDBX_reader) + 1;
if (size & (env->me_os_psize - 1) || size < env->me_os_psize) {
mdbx_notice("lck-file has invalid size %" PRIu64 " bytes", size);
return MDBX_PROBLEM;
}
const uint64_t maxreaders =
(size - sizeof(MDBX_lockinfo)) / sizeof(MDBX_reader) + 1;
if (maxreaders > UINT16_MAX) {
mdbx_notice("lck-size too big (up to %" PRIu64 " readers)", maxreaders);
return MDBX_PROBLEM;
}
env->me_maxreaders = (unsigned)maxreaders;
void *addr = NULL; void *addr = NULL;
err = mdbx_mmap(&addr, size, true, env->me_lfd); err = mdbx_mmap(&addr, size, true, env->me_lfd);