forked from pool/libvirt
82e6ddc91c
- Don't exceed specified length when reading from stream 5004f121-virFdStreamThread-dont-exceed-length.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=607
86 lines
3.1 KiB
Diff
86 lines
3.1 KiB
Diff
commit 5004f121bc572c58d9721bf7bf3c3a1988720ba8
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Author: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon Jun 5 13:22:23 2017 +0200
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virFDStreamThread: Make sure we won't exceed @length
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There's a problem with current streams after I switched them from
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iohelper to thread implementation. Previously, iohelper made sure
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not to exceed specified @length resulting in the pipe EOF
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appearing at the exact right moment (the pipe was used to tunnel
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the data from the iohelper to the daemon). Anyway, when switching
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to thread I had to write the I/O code from scratch. Whilst doing
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that I took an inspiration from the iohelper code, but since the
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usage of pipe switched to slightly different meaning, there was
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no 1:1 relationship between the codes.
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Moreover, after introducing VIR_FDSTREAM_MSG_TYPE_HOLE, the
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condition that should made sure we won't exceed @length was
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completely wrong.
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The fix is to:
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a) account for holes for @length
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b) cap not just data sections but holes too (if @length would be
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exceeded)
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For this purpose, the condition needs to be brought closer to the
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code that handles holes and data sections.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Index: libvirt-3.4.0/src/util/virfdstream.c
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===================================================================
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--- libvirt-3.4.0.orig/src/util/virfdstream.c
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+++ libvirt-3.4.0/src/util/virfdstream.c
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@@ -420,6 +420,8 @@ virFDStreamThreadDoRead(virFDStreamDataP
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const int fdout,
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const char *fdinname,
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const char *fdoutname,
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+ size_t length,
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+ size_t total,
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size_t *dataLen,
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size_t buflen)
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{
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@@ -433,10 +435,18 @@ virFDStreamThreadDoRead(virFDStreamDataP
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if (virFileInData(fdin, &inData, §ionLen) < 0)
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goto error;
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+ if (length &&
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+ sectionLen > length - total)
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+ sectionLen = length - total;
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+
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if (inData)
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*dataLen = sectionLen;
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}
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+ if (length &&
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+ buflen > length - total)
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+ buflen = length - total;
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+
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if (VIR_ALLOC(msg) < 0)
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goto error;
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@@ -578,13 +588,6 @@ virFDStreamThread(void *opaque)
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while (1) {
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ssize_t got;
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- if (length &&
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- (length - total) < buflen)
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- buflen = length - total;
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-
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- if (buflen == 0)
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- break; /* End of requested data from client */
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-
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while (doRead == (fdst->msg != NULL) &&
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!fdst->threadQuit) {
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if (virCondWait(&fdst->threadCond, &fdst->parent.lock)) {
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@@ -608,6 +611,7 @@ virFDStreamThread(void *opaque)
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got = virFDStreamThreadDoRead(fdst, sparse,
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fdin, fdout,
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fdinname, fdoutname,
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+ length, total,
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&dataLen, buflen);
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else
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got = virFDStreamThreadDoWrite(fdst, sparse,
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