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[UDFS] Fix PAGE_FAULT_IN_NONPAGED_AREA BSODs #3

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[UDFS] Fix PAGE_FAULT_IN_NONPAGED_AREA BSODs #3

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cffe655
refactoring
assorted Feb 2, 2026
a3305a9
UDFInsertPrefix
assorted Feb 14, 2026
991f517
Merge branch 'udf-dev' of https://github.com/zero3k20/reactos into ud…
Zero3K20 Apr 27, 2026
80e31d2
[UDFS] Fix PAGE_FAULT_IN_NONPAGED_AREA BSODs
Zero3K20 Feb 4, 2026
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9 changes: 9 additions & 0 deletions drivers/filesystems/udfs/read.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@ UDFCommonRead(
PVCB Vcb = NULL;
BOOLEAN VcbAcquired = FALSE;
BOOLEAN FcbAcquired = FALSE;
BOOLEAN PagingIoResourceAcquired = FALSE;
PVOID SystemBuffer = NULL;

BOOLEAN Wait;
Expand Down Expand Up @@ -157,6 +158,11 @@ UDFCommonRead(

UDFAcquireFcbSharedStarveExclusive(IrpContext, Fcb, FALSE);
FcbAcquired = TRUE;
// Acquire PagingIo resource shared to serialize with writes that hold
// it exclusively while modifying the extent mapping (UDFResizeExtent).
// This prevents a use-after-free when iterating DataLoc.Mapping.
UDFAcquireResourceShared(&Fcb->FcbNonpaged->FcbPagingIoResource, TRUE);
PagingIoResourceAcquired = TRUE;

} else {

Expand Down Expand Up @@ -406,6 +412,9 @@ try_exit: NOTHING;

} _SEH2_FINALLY {

if (PagingIoResourceAcquired) {
UDFReleaseResource(&Fcb->FcbNonpaged->FcbPagingIoResource);
}
if (FcbAcquired) {

UDFReleaseFcb(IrpContext, Fcb);
Expand Down