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8d4abca95e
Fix an 11-year old bug in ngene_command_config_free_buf() while
addressing the following warnings caught with -Warray-bounds:
arch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
The problem is that the original code is trying to copy 6 bytes of
data into a one-byte size member _config_ of the wrong structue
FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a
legitimate compiler warning because memcpy() overruns the length
of &com.cmd.ConfigureBuffers.config. It seems that the right
structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains
6 more members apart from the header _hdr_. Also, the name of
the function ngene_command_config_free_buf() suggests that the actual
intention is to ConfigureFreeBuffers, instead of ConfigureBuffers
(which takes place in the function ngene_command_config_buf(), above).
Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS
into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as
the destination address, instead of &com.cmd.ConfigureBuffers.config,
when calling memcpy().
This also helps with the ongoing efforts to globally enable
-Warray-bounds and get us closer to being able to tighten the
FORTIFY_SOURCE routines on memcpy().
Link: https://github.com/KSPP/linux/issues/109
Fixes:
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| .. | ||
| b2c2 | ||
| bt8xx | ||
| cobalt | ||
| cx18 | ||
| cx88 | ||
| cx23885 | ||
| cx25821 | ||
| ddbridge | ||
| dm1105 | ||
| dt3155 | ||
| intel | ||
| ivtv | ||
| mantis | ||
| meye | ||
| netup_unidvb | ||
| ngene | ||
| pluto2 | ||
| pt1 | ||
| pt3 | ||
| saa7134 | ||
| saa7146 | ||
| saa7164 | ||
| smipcie | ||
| solo6x10 | ||
| sta2x11 | ||
| ttpci | ||
| tw68 | ||
| tw686x | ||
| tw5864 | ||
| Kconfig | ||
| Makefile | ||