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Date: Mon, 15 Sep 2014 12:25:11 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Markos Chandras <markos.chandras@...tec.com>, linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org> Subject: [PATCH 3.16 072/158] MIPS: Malta: Improve system memory detection for {e, }memsize >= 2G 3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Markos Chandras <markos.chandras@...tec.com> commit 64615682658373516863b5b5971ff1d922d0ae7b upstream. Using kstrtol to parse the "{e,}memsize" variables was wrong because this parses signed long numbers. In case of '{e,}memsize' >= 2G, the top bit is set, resulting to -ERANGE errors and possibly random system memory boundaries. We fix this by replacing "kstrtol" with "kstrtoul". We also improve the code to check the kstrtoul return value and print a warning if an error was returned. Signed-off-by: Markos Chandras <markos.chandras@...tec.com> Cc: linux-mips@...ux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7543/ Signed-off-by: Ralf Baechle <ralf@...ux-mips.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/mips/mti-malta/malta-memory.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) --- a/arch/mips/mti-malta/malta-memory.c +++ b/arch/mips/mti-malta/malta-memory.c @@ -34,13 +34,19 @@ fw_memblock_t * __init fw_getmdesc(int e /* otherwise look in the environment */ memsize_str = fw_getenv("memsize"); - if (memsize_str) - tmp = kstrtol(memsize_str, 0, &memsize); + if (memsize_str) { + tmp = kstrtoul(memsize_str, 0, &memsize); + if (tmp) + pr_warn("Failed to read the 'memsize' env variable.\n"); + } if (eva) { /* Look for ememsize for EVA */ ememsize_str = fw_getenv("ememsize"); - if (ememsize_str) - tmp = kstrtol(ememsize_str, 0, &ememsize); + if (ememsize_str) { + tmp = kstrtoul(ememsize_str, 0, &ememsize); + if (tmp) + pr_warn("Failed to read the 'ememsize' env variable.\n"); + } } if (!memsize && !ememsize) { pr_warn("memsize not set in YAMON, set to default (32Mb)\n"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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