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From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Subject: [PATCH 01/11] argv-array: use size_t for count and alloc
Date: Tue, 28 Jul 2020 16:21:52 -0400	[thread overview]
Message-ID: <20200728202152.GA1021513@coredump.intra.peff.net> (raw)
In-Reply-To: <20200728202124.GA1021264@coredump.intra.peff.net>

On most 64-bit platforms, "int" is significantly smaller than a size_t,
which could lead to integer overflow and under-allocation of the array.
It's probably impossible to trigger in practice, as it would imply on
the order of 2^32 individual allocations. Even if was possible to grow
an array in that way (and we typically only use it for sets of strings,
like command line options), each allocation needs a pointer, malloc
overhead, etc. You'd quite likely run out of RAM before succeeding in
such an overflow.

But all that hand-waving aside, it's easy enough to use the correct
type, so let's do so.

Signed-off-by: Jeff King <peff@peff.net>
---
This one is obviously of value even without the renaming.

 argv-array.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/argv-array.h b/argv-array.h
index a7d3b10707..4fc57b6902 100644
--- a/argv-array.h
+++ b/argv-array.h
@@ -29,8 +29,8 @@ extern const char *empty_argv[];
  */
 struct argv_array {
 	const char **argv;
-	int argc;
-	int alloc;
+	size_t argc;
+	size_t alloc;
 };
 
 #define ARGV_ARRAY_INIT { empty_argv, 0, 0 }
-- 
2.28.0.rc2.475.g53c7e1c7f4


  reply	other threads:[~2020-07-28 20:21 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28 20:21 [PATCH 0/11] renaming argv_array Jeff King
2020-07-28 20:21 ` Jeff King [this message]
2020-07-28 20:23 ` [PATCH 02/11] argv-array: rename to strvec Jeff King
2020-07-28 20:23 ` [PATCH 03/11] strvec: rename files from argv-array " Jeff King
2020-07-28 20:24 ` [PATCH 04/11] quote: rename sq_dequote_to_argv_array to mention strvec Jeff King
2020-07-28 20:24 ` [PATCH 05/11] strvec: convert builtin/ callers away from argv_array name Jeff King
2020-07-28 20:24 ` [PATCH 06/11] strvec: convert more " Jeff King
2020-07-28 20:25 ` [PATCH 07/11] strvec: convert remaining " Jeff King
2020-07-28 20:26 ` [PATCH 08/11] strvec: fix indentation in renamed calls Jeff King
2020-07-28 22:43   ` Jacob Keller
2020-07-28 23:31     ` Junio C Hamano
2020-07-28 20:26 ` [PATCH 09/11] strvec: update documention to avoid argv_array Jeff King
2020-07-28 20:27 ` [PATCH 10/11] strvec: drop argv_array compatibility layer Jeff King
2020-07-28 22:23   ` Junio C Hamano
2020-07-29  0:04     ` Jeff King
2020-07-29  0:37       ` Jeff King
2020-07-29  0:40         ` Jeff King
2020-07-29  0:47           ` Junio C Hamano
2020-07-29 16:54             ` Derrick Stolee
2020-07-29  0:44         ` Junio C Hamano
2020-07-29 16:22           ` Jeff King
2020-07-28 20:28 ` [PATCH 11/11] strvec: rename struct fields Jeff King
2020-07-28 21:16   ` Junio C Hamano
2020-07-28 21:18     ` Junio C Hamano
2020-07-29  6:55       ` Christian Couder
2020-07-29 16:34         ` Jeff King
2020-07-29 18:03           ` Junio C Hamano
2020-07-28 21:20     ` Jeff King
2020-07-28 22:45 ` [PATCH 0/11] renaming argv_array Jacob Keller
2020-07-29  0:06   ` Jeff King
2020-07-29  6:15 ` Christian Couder
2020-07-29  6:19   ` Christian Couder
2020-07-29 13:32   ` Eric Sunshine
2020-07-29 16:33   ` Jeff King
2020-08-11 16:08 ` René Scharfe
2020-08-11 18:28   ` Taylor Blau
2020-08-11 19:00   ` Junio C Hamano
2020-08-11 20:39     ` Jacob Keller
2020-08-11 21:03       ` Junio C Hamano
2020-08-12 12:42     ` Johannes Schindelin
2020-08-12 15:06   ` Jeff King
2020-08-12 15:10     ` Jeff King
2020-08-12 16:23       ` René Scharfe
2020-08-12 17:08         ` Jeff King
2020-08-12 18:18           ` René Scharfe
2020-08-12 19:57             ` Jeff King

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