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kernel/fs: Fix handling of partial requests in do_synchronous_iterative_vnode_io.

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If get_vecs returns 0 and no vecs, then we need to quit iterating.
Otherwise we'll just loop forever and leak memory.

Also add an assert in IOBuffer::GetNextVirtualVec that would have caught
this problem, and the memory leak it results in.
This commit is contained in:
Augustin Cavalier 2024-11-20 15:47:56 -05:00
parent e829154ffe
commit 5c56d775a9
2 changed files with 14 additions and 6 deletions
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3
src/system/kernel/device_manager/IORequest.cpp
View File

@ -168,6 +168,7 @@ IOBuffer::GetNextVirtualVec(void*& _cookie, iovec& vector)
&& (fVecCount > 1 || fVecs[0].length > B_PAGE_SIZE)) {
void* mappedAddress;
addr_t mappedSize;
ASSERT(cookie->mapped_area == -1);
// TODO: This is a potential violation of the VIP requirement, since
// vm_map_physical_memory_vecs() allocates memory without special flags!
@ -216,9 +217,9 @@ void
IOBuffer::FreeVirtualVecCookie(void* _cookie)
{
virtual_vec_cookie* cookie = (virtual_vec_cookie*)_cookie;
if (cookie->mapped_area >= 0)
delete_area(cookie->mapped_area);
cookie->PutPhysicalPageIfNeeded();
free_etc(cookie, fVIP ? HEAP_PRIORITY_VIP : 0);

15
src/system/kernel/fs/vfs_request_io.cpp
View File

@ -292,8 +292,9 @@ do_synchronous_iterative_vnode_io(struct vnode* vnode, void* openCookie,
generic_size_t length = request->Length();
status_t error = B_OK;
bool partial = false;
for (; error == B_OK && length > 0
for (; error == B_OK && length > 0 && !partial
&& buffer->GetNextVirtualVec(virtualVecCookie, vector) == B_OK;) {
uint8* vecBase = (uint8*)vector.iov_base;
generic_size_t vecLength = min_c(vector.iov_len, length);
@ -309,8 +310,12 @@ do_synchronous_iterative_vnode_io(struct vnode* vnode, void* openCookie,
fileVecs[0].length = vecLength;
fileVecCount = 1;
}
if (error != B_OK || fileVecCount == 0)
if (error != B_OK)
break;
if (fileVecCount == 0) {
partial = true;
break;
}
for (size_t i = 0; i < fileVecCount; i++) {
const file_io_vec& fileVec = fileVecs[i];
@ -325,15 +330,17 @@ do_synchronous_iterative_vnode_io(struct vnode* vnode, void* openCookie,
vecBase += transferred;
vecLength -= transferred;
if (transferred != toTransfer)
if (transferred != toTransfer) {
partial = true;
break;
}
}
}
}
buffer->FreeVirtualVecCookie(virtualVecCookie);
bool partial = length > 0;
partial = (partial || length > 0);
size_t bytesTransferred = request->Length() - length;
request->SetTransferredBytes(partial, bytesTransferred);
if (finished != NULL)