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MIPS: fw: Allow firmware to pass a empty env
fw_getenv will use env entry to determine style of env, however it is legal for firmware to just pass a empty list. Check if first entry exist before running strchr to avoid null pointer dereference. Cc: stable@vger.kernel.org Link: https://github.com/clbr/n64bootloader/issues/5 Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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@ -53,7 +53,7 @@ char *fw_getenv(char *envname)
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{
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{
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char *result = NULL;
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char *result = NULL;
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if (_fw_envp != NULL) {
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if (_fw_envp != NULL && fw_envp(0) != NULL) {
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/*
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/*
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* Return a pointer to the given environment variable.
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* Return a pointer to the given environment variable.
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* YAMON uses "name", "value" pairs, while U-Boot uses
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* YAMON uses "name", "value" pairs, while U-Boot uses
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