/* mpiutil.ac - Utility functions for MPI * Copyright (C) 1998, 1999 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * GnuPG is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include "mpi-internal.h" /**************** * Note: It was a bad idea to use the number of limbs to allocate * because on a alpha the limbs are large but we normally need * integers of n bits - So we should chnage this to bits (or bytes). * * But mpi_alloc is used in a lot of places :-) */ MPI mpi_alloc(unsigned nlimbs) { MPI a; a = kmalloc(sizeof *a, GFP_KERNEL); if (!a) return a; if (nlimbs) { a->d = mpi_alloc_limb_space(nlimbs); if (!a->d) { kfree(a); return NULL; } } else { a->d = NULL; } a->alloced = nlimbs; a->nlimbs = 0; a->sign = 0; a->flags = 0; a->nbits = 0; return a; } EXPORT_SYMBOL_GPL(mpi_alloc); mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs) { size_t len = nlimbs * sizeof(mpi_limb_t); if (!len) return NULL; return kmalloc(len, GFP_KERNEL); } void mpi_free_limb_space(mpi_ptr_t a) { if (!a) return; kfree(a); } void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs) { mpi_free_limb_space(a->d); a->d = ap; a->alloced = nlimbs; } /**************** * Resize the array of A to NLIMBS. the additional space is cleared * (set to 0) [done by m_realloc()] */ int mpi_resize(MPI a, unsigned nlimbs) { void *p; if (nlimbs <= a->alloced) return 0; /* no need to do it */ if (a->d) { p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL); if (!p) return -ENOMEM; memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t)); kfree(a->d); a->d = p; } else { a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL); if (!a->d) return -ENOMEM; } a->alloced = nlimbs; return 0; } void mpi_free(MPI a) { if (!a) return; if (a->flags & 4) kfree(a->d); else mpi_free_limb_space(a->d); if (a->flags & ~7) pr_info("invalid flag value in mpi\n"); kfree(a); } EXPORT_SYMBOL_GPL(mpi_free); MODULE_DESCRIPTION("Multiprecision maths library"); MODULE_LICENSE("GPL"); devel-stable Russell King's ARM Linux kernel treeRussell King
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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-14 17:01:46 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2020-02-14 17:19:19 -0800
commit3d87c75d84e20d8812dbfba87e46ffca29d75d40 (patch)
treeffbe8d9d4626a8eafcbb1daad3a07502a8474baf /arch/arm/mach-bcm
parent5179a9dfa9440c1781816e2c9a183d1d2512dc61 (diff)
Input: gpio_keys_polled - replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Link: https://lore.kernel.org/r/20200214171907.GA26588@embeddedor Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'arch/arm/mach-bcm')
0 files changed, 0 insertions, 0 deletions
generated by cgit (git 2.34.1) at 2025-10-28 17:27:17 +0000