XArray: Fix an arithmetic error in xa_is_err
There is a math problem here which leads to a lot of static checker
warnings for me:
net/sunrpc/clnt.c:451 rpc_new_client() error: (-4096) too low for ERR_PTR
Error values are from -1 to -4095 or from 0xffffffff to 0xfffff001 in
hexadecimal. (I am assuming a 32 bit system for simplicity). We are
using the lowest two bits to hold some internal XArray data so the
error is shifted two spaces to the left. 0xfffff001 << 2 is 0xffffc004.
And finally we want to check that BIT(1) is set so we add 2 which gives
us 0xffffc006.
In other words, we should be checking that "entry >= 0xffffc006", but
the check is actually testing if "entry >= 0xffffc002".
Fixes: 76b4e52995
("XArray: Permit storing 2-byte-aligned pointers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[Use xa_mk_internal() instead of changing the bracketing]
Signed-off-by: Matthew Wilcox <willy@infradead.org>
hifive-unleashed-5.1
parent
d69d287a90
commit
edcddd4c87
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@ -177,7 +177,7 @@ static inline bool xa_is_internal(const void *entry)
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static inline bool xa_is_err(const void *entry)
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{
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return unlikely(xa_is_internal(entry) &&
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(unsigned long)entry >= -((MAX_ERRNO << 2) + 2));
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entry >= xa_mk_internal(-MAX_ERRNO));
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}
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/**
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