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commit 9d9adc9d6c8eb24a6884da81c18b927ea706a68e
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Author: Nathan Scott <nathans@redhat.com>
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Date: Tue Dec 7 11:18:11 2021 +1100
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pmdanvidia: fix mishandling of zero-byte size passed to realloc
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Picked up during QA of recent nvidia changes - some hardware lacks
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support for per-process metrics, or the hardware (GPU) has not yet
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been accessed by a process using its resources, which had the side
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effect that a zero-byte size argument was passed into realloc. In
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turn, this passes back something that can be freed and an issue in
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the logic meant this would happen on subsequent calls also.
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Resolves the QA failure and Red Hat BZ #2029301
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diff --git a/src/pmdas/nvidia/nvidia.c b/src/pmdas/nvidia/nvidia.c
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index f1c12f2275..dc5bb93a0d 100644
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--- a/src/pmdas/nvidia/nvidia.c
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+++ b/src/pmdas/nvidia/nvidia.c
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@@ -617,11 +617,16 @@ refresh(pcp_nvinfo_t *nvinfo, int need_processes)
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/* update indoms, cull old entries that remain inactive */
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if (need_processes) {
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pmdaIndom *proc_indomp = &indomtab[PROC_INDOM];
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- pmdaInstid *it_set = proc_indomp->it_set;
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+ pmdaInstid *it_set = NULL;
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size_t bytes = nproc * sizeof(pmdaInstid);
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- if ((it_set = (pmdaInstid *)realloc(it_set, bytes)) == NULL)
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+ if (bytes > 0) {
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+ it_set = (pmdaInstid *)realloc(proc_indomp->it_set, bytes);
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+ if (it_set == NULL)
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+ free(proc_indomp->it_set);
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+ } else if (proc_indomp->it_set != NULL) {
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free(proc_indomp->it_set);
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+ }
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if ((proc_indomp->it_set = it_set) != NULL) {
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for (i = j = 0; i < processes.hsize && j < nproc; i++) {
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