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authorGustavo A. R. Silva <gustavoars@kernel.org>2020-05-19 01:19:04 +0300
committerLi Yang <leoyang.li@nxp.com>2020-05-23 00:23:02 +0300
commit661ea25e5319d0ceaeba80dbc2e083245d91f57a (patch)
tree1850783aabb7966a6e17b47fc35410613983304e /drivers/soc
parentd3e81989c0f028aa80cb97fcba83df40585b640d (diff)
downloadlinux-661ea25e5319d0ceaeba80dbc2e083245d91f57a.tar.xz
soc: fsl: qe: Replace one-element array and use struct_size() helper
The current codebase makes use of one-element arrays in the following form: struct something { int length; u8 data[1]; }; struct something *instance; instance = kmalloc(sizeof(*instance) + size, GFP_KERNEL); instance->length = size; memcpy(instance->data, source, size); 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. So, replace the one-element array with a flexible-array member. Also, make use of the new struct_size() helper to properly calculate the size of struct qe_firmware. This issue was found with the help of Coccinelle and, audited and fixed _manually_. [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 <gustavoars@kernel.org> Reviewed-by: Qiang Zhao <qiang.zhao@nxp.com> Signed-off-by: Li Yang <leoyang.li@nxp.com>
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/fsl/qe/qe.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index 447146861c2c..2df20d6f85fa 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -448,7 +448,7 @@ int qe_upload_firmware(const struct qe_firmware *firmware)
unsigned int i;
unsigned int j;
u32 crc;
- size_t calc_size = sizeof(struct qe_firmware);
+ size_t calc_size;
size_t length;
const struct qe_header *hdr;
@@ -480,7 +480,7 @@ int qe_upload_firmware(const struct qe_firmware *firmware)
}
/* Validate the length and check if there's a CRC */
- calc_size += (firmware->count - 1) * sizeof(struct qe_microcode);
+ calc_size = struct_size(firmware, microcode, firmware->count);
for (i = 0; i < firmware->count; i++)
/*