linux-kernel - [tip:perf/hw-branch-sampling] perf tools: Fix ABI compatibility bug in print_event

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Date:	Fri, 9 Mar 2012 05:31:42 -0800
From:	tip-bot for Stephane Eranian <eranian@...gle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/hw-branch-sampling] perf tools:
  Fix ABI compatibility bug in print_event_desc()

Commit-ID:  62db90681c0db8c76e5db006b929a2edd5d12ae6
Gitweb:     http://git.kernel.org/tip/62db90681c0db8c76e5db006b929a2edd5d12ae6
Author:     Stephane Eranian <eranian@...gle.com>
AuthorDate: Thu, 9 Feb 2012 23:21:07 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 9 Mar 2012 08:26:06 +0100

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@...gle.com>
Cc: peterz@...radead.org
Cc: acme@...hat.com
Cc: robert.richter@....com
Cc: ming.m.lin@...el.com
Cc: andi@...stfloor.org
Cc: asharma@...com
Cc: ravitillo@....gov
Cc: vweaver1@...s.utk.edu
Cc: khandual@...ux.vnet.ibm.com
Cc: dsahern@...il.com
Link: http://lkml.kernel.org/r/1328826068-11713-18-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/util/header.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 666f189..6d58026 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;
--
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