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util: Avoid possible NULL dereference in virSysinfoParsePPCProcessor

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Found by Coverity. Because there's an "if ((cur = strstr(base, "revision"))
 != NULL) {" followed by a "base = cur" coverity notes that 'base' could
then be NULL causing the return to the top of the "while ((tmp_base =
strstr(base, "processor")) != NULL) {" to have strstr deref a NULL 'base'
pointer because the setting of base at the bottom of the loop is unconditional.

Alter the code to set "base = cur" after processing each key. That will
"ensure" that base doesn't get set to NULL if both "cpu" and "revision"
do no follow a "processor".

While a /proc/cpuinfo file that has a "processor" key but with neither
a "cpu" nor a "revision" doesn't seem feasible, the code is written as if
it could happen, so we have to account for it.

Signed-off-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
John Ferlan 2017-03-07 07:01:21 -05:00
parent 7744d99415
commit 15b881474b
1 changed files with 3 additions and 1 deletions
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4
src/util/virsysinfo.c
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@ -231,6 +231,7 @@ virSysinfoParsePPCProcessor(const char *base, virSysinfoDefPtr ret)
if (eol && VIR_STRNDUP(processor->processor_socket_destination,
cur, eol - cur) < 0)
return -1;
base = cur;
if ((cur = strstr(base, "cpu")) != NULL) {
cur = strchr(cur, ':') + 1;
@ -239,6 +240,7 @@ virSysinfoParsePPCProcessor(const char *base, virSysinfoDefPtr ret)
if (eol && VIR_STRNDUP(processor->processor_type,
cur, eol - cur) < 0)
return -1;
base = cur;
}
if ((cur = strstr(base, "revision")) != NULL) {
@ -248,9 +250,9 @@ virSysinfoParsePPCProcessor(const char *base, virSysinfoDefPtr ret)
if (eol && VIR_STRNDUP(processor->processor_version,
cur, eol - cur) < 0)
return -1;
base = cur;
}
base = cur;
}
return 0;