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authorStephane Eranian <eranian@google.com>2012-02-10 02:21:07 +0400
committerIngo Molnar <mingo@elte.hu>2012-03-09 11:26:06 +0400
commit62db90681c0db8c76e5db006b929a2edd5d12ae6 (patch)
tree9a758f8c9c41b34ae96533571a132b226819803f /tools
parent69996df486fc3921bbaaa17fca0d68f537f9eabf (diff)
downloadlinux-62db90681c0db8c76e5db006b929a2edd5d12ae6.tar.xz
perf tools: Fix ABI compatibility bug in print_event_desc()
This patches cleans up local variable types for msz and ret. They need to be size_t and ssize_t respectively. It also fixes a bug whereby perf would not read attr struct with a different size than what it knows about. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: peterz@infradead.org Cc: acme@redhat.com Cc: robert.richter@amd.com Cc: ming.m.lin@intel.com Cc: andi@firstfloor.org Cc: asharma@fb.com Cc: ravitillo@lbl.gov Cc: vweaver1@eecs.utk.edu Cc: khandual@linux.vnet.ibm.com Cc: dsahern@gmail.com Link: http://lkml.kernel.org/r/1328826068-11713-18-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/header.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 666f18972fa3..6d580267d043 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1144,8 +1144,9 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
uint64_t id;
void *buf = NULL;
char *str;
- u32 nre, sz, nr, i, j, msz;
- int ret;
+ u32 nre, sz, nr, i, j;
+ ssize_t ret;
+ size_t msz;
/* number of events */
ret = read(fd, &nre, sizeof(nre));
@@ -1162,25 +1163,23 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
if (ph->needs_swap)
sz = bswap_32(sz);
- /*
- * ensure it is at least to our ABI rev
- */
- if (sz < (u32)sizeof(attr))
- goto error;
-
memset(&attr, 0, sizeof(attr));
- /* read entire region to sync up to next field */
+ /* buffer to hold on file attr struct */
buf = malloc(sz);
if (!buf)
goto error;
msz = sizeof(attr);
- if (sz < msz)
+ if (sz < (ssize_t)msz)
msz = sz;
for (i = 0 ; i < nre; i++) {
+ /*
+ * must read entire on-file attr struct to
+ * sync up with layout.
+ */
ret = read(fd, buf, sz);
if (ret != (ssize_t)sz)
goto error;