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commit 57553571df2f33ec45a81fa5599873ddfc890c92
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Author: Andrew Price <anprice@redhat.com>
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Date: Thu Sep 6 14:28:19 2018 +0100
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libgfs2: Fix pointer cast byte order issue
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lgfs2_field_assign() currently uses pointer casting to achieve generic
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integer assignment based on the width of the field, but this is broken
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as a uin32_t field can be assigned the value from the high bytes of the
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uint64_t value, for instance. To fix this, store the value into a
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uint64_t before casting to the narrower types.
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Signed-off-by: Andrew Price <anprice@redhat.com>
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diff --git a/gfs2/libgfs2/meta.c b/gfs2/libgfs2/meta.c
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index a8289466..e0ea4912 100644
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--- a/gfs2/libgfs2/meta.c
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+++ b/gfs2/libgfs2/meta.c
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@@ -940,6 +940,7 @@ int lgfs2_field_str(char *str, const size_t size, const char *blk, const struct
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int lgfs2_field_assign(char *blk, const struct lgfs2_metafield *field, const void *val)
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{
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char *fieldp = blk + field->offset;
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+ uint64_t num = *(uint64_t *)val;
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if (field->flags & LGFS2_MFF_UUID) {
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memcpy(fieldp, val, 16);
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@@ -959,16 +960,16 @@ int lgfs2_field_assign(char *blk, const struct lgfs2_metafield *field, const voi
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switch(field->length) {
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case sizeof(uint8_t):
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- *fieldp = *(uint8_t *)val;
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+ *fieldp = (uint8_t)num;
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return 0;
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case sizeof(uint16_t):
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- *(uint16_t *)fieldp = cpu_to_be16(*(uint16_t *)val);
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+ *(uint16_t *)fieldp = cpu_to_be16((uint16_t)num);
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return 0;
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case sizeof(uint32_t):
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- *(uint32_t *)fieldp = cpu_to_be32(*(uint32_t *)val);
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+ *(uint32_t *)fieldp = cpu_to_be32((uint32_t)num);
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return 0;
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case sizeof(uint64_t):
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- *(uint64_t *)fieldp = cpu_to_be64(*(uint64_t *)val);
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+ *(uint64_t *)fieldp = cpu_to_be64((uint64_t)num);
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return 0;
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default:
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/* Will never happen */
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