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ole32: Do not lock storage in read-only deny-write mode.

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Daniel Lehman 2024-03-01 20:46:39 -08:00 • committed by Alexandre Julliard
parent 6fa1458378
commit 2fc073591b
2 changed files with 6 additions and 4 deletions
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8
dlls/ole32/storage32.c
View file

@ -5036,7 +5036,7 @@ static HRESULT StorageImpl_GrabLocks(StorageImpl *This, DWORD openFlags)
ULARGE_INTEGER offset;
ULARGE_INTEGER cb;
DWORD share_mode = STGM_SHARE_MODE(openFlags);
BOOL supported;
BOOL supported, ro_denyw;
if (openFlags & STGM_NOSNAPSHOT)
{
@ -5045,6 +5045,8 @@ static HRESULT StorageImpl_GrabLocks(StorageImpl *This, DWORD openFlags)
else if (share_mode != STGM_SHARE_EXCLUSIVE) share_mode = STGM_SHARE_DENY_WRITE;
}
ro_denyw = (STGM_ACCESS_MODE(openFlags) == STGM_READ) && (share_mode == STGM_SHARE_DENY_WRITE);
/* Wrap all other locking inside a single lock so we can check ranges safely */
offset.QuadPart = RANGELOCK_CHECKLOCKS;
cb.QuadPart = 1;
@ -5088,7 +5090,7 @@ static HRESULT StorageImpl_GrabLocks(StorageImpl *This, DWORD openFlags)
hr = StorageImpl_LockOne(This, RANGELOCK_PRIORITY2_FIRST, RANGELOCK_PRIORITY2_LAST);
}
if (SUCCEEDED(hr) && (STGM_ACCESS_MODE(openFlags) != STGM_WRITE))
if (SUCCEEDED(hr) && (STGM_ACCESS_MODE(openFlags) != STGM_WRITE) && !ro_denyw)
hr = StorageImpl_LockOne(This, RANGELOCK_READ_FIRST, RANGELOCK_READ_LAST);
if (SUCCEEDED(hr) && (STGM_ACCESS_MODE(openFlags) != STGM_READ))
@ -5097,7 +5099,7 @@ static HRESULT StorageImpl_GrabLocks(StorageImpl *This, DWORD openFlags)
if (SUCCEEDED(hr) && (share_mode == STGM_SHARE_DENY_READ || share_mode == STGM_SHARE_EXCLUSIVE))
hr = StorageImpl_LockOne(This, RANGELOCK_DENY_READ_FIRST, RANGELOCK_DENY_READ_LAST);
if (SUCCEEDED(hr) && (share_mode == STGM_SHARE_DENY_WRITE || share_mode == STGM_SHARE_EXCLUSIVE))
if (SUCCEEDED(hr) && (share_mode == STGM_SHARE_DENY_WRITE || share_mode == STGM_SHARE_EXCLUSIVE) && !ro_denyw)
hr = StorageImpl_LockOne(This, RANGELOCK_DENY_WRITE_FIRST, RANGELOCK_DENY_WRITE_LAST);
if (SUCCEEDED(hr) && (openFlags & STGM_NOSNAPSHOT) == STGM_NOSNAPSHOT)

2
dlls/ole32/tests/storage32.c
View file

@ -3394,7 +3394,7 @@ static const struct lock_test lock_tests[] = {
{ STGM_READWRITE|STGM_TRANSACTED, FALSE, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, rw_locked_bytes, rw_fail_ranges, FALSE },
{ STGM_READWRITE|STGM_TRANSACTED|STGM_NOSNAPSHOT, FALSE, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, nosn_locked_bytes, rwdw_fail_ranges, FALSE },
{ STGM_READWRITE|STGM_TRANSACTED|STGM_SHARE_DENY_WRITE, FALSE, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ, rwdw_locked_bytes, rwdw_fail_ranges, FALSE },
{ STGM_READ|STGM_SHARE_DENY_WRITE, FALSE, GENERIC_READ, FILE_SHARE_READ, no_locked_bytes, dw_fail_ranges, TRUE },
{ STGM_READ|STGM_SHARE_DENY_WRITE, FALSE, GENERIC_READ, FILE_SHARE_READ, no_locked_bytes, dw_fail_ranges, FALSE },
{ STGM_READ|STGM_TRANSACTED, FALSE, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, tr_locked_bytes, tr_fail_ranges, FALSE },
{ STGM_READ|STGM_SHARE_EXCLUSIVE, FALSE, GENERIC_READ, FILE_SHARE_READ, roex_locked_bytes, roex_fail_ranges, FALSE },
{ STGM_READ|STGM_SHARE_EXCLUSIVE|STGM_TRANSACTED, FALSE, GENERIC_READ, FILE_SHARE_READ, roex_locked_bytes, roex_fail_ranges, FALSE },