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conf: fix use after free in virChrdevOpen

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Don't free the stream on error if we've successfully added it
to the hash table, since it will be freed by virChrdevHashEntryFree
callback.

Preserve the error message before calling virStreamFree, since it
resets the error.

Introduced by 4716138, crashing since 6921892.

Reported by Sergey Fionov on libvir-list.
This commit is contained in:
Ján Tomko 2013-05-22 12:56:23 +02:00
parent a551e9e1fc
commit a32b41746c
1 changed files with 13 additions and 2 deletions
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15
src/conf/virchrdev.c
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@ -341,6 +341,8 @@ int virChrdevOpen(virChrdevsPtr devs,
virStreamPtr savedStream;
char *path;
int ret;
bool added = false;
virErrorPtr savedError;
switch (source->type) {
case VIR_DOMAIN_CHR_TYPE_PTY:
@ -397,6 +399,7 @@ int virChrdevOpen(virChrdevsPtr devs,
if (virHashAddEntry(devs->hash, path, st) < 0)
goto error;
added = true;
cbdata->devs = devs;
if (VIR_STRDUP(cbdata->path, path) < 0)
@ -429,8 +432,16 @@ int virChrdevOpen(virChrdevsPtr devs,
return 0;
error:
virStreamFree(st);
virHashRemoveEntry(devs->hash, path);
savedError = virSaveLastError();
if (added)
virHashRemoveEntry(devs->hash, path);
else
virStreamFree(st);
virSetError(savedError);
virFreeError(savedError);
if (cbdata)
VIR_FREE(cbdata->path);
VIR_FREE(cbdata);